Can I use the ETENWOLF Zephyr S5 while it is charging?

No. The inflator cannot be operated during charging. Always disconnect the charger before inflating tires or using the power bank output. The unit will automatically shut off while connected to a charging source.

What should I do if the tire pressure reads lower after I finish inflating?

This is normal. After inflation, the temperature inside the tire gradually decreases to ambient temperature, causing tire pressure to drop by approximately 0.5 to 1.5 PSI. This is a standard physical effect. Inflate slightly above your target value if needed to compensate.

How do I switch between PSI, KPa, and Bar on the Zephyr S5?

Press the Unit button (Button 1 on the control panel) to cycle through PSI, KPa, and Bar. The selected unit is shown on the center display.

Why might the pressure reading be 1–3 PSI different at high altitude?

Atmospheric pressure varies with altitude, which can cause a variance of 1–3 PSI in the inflator's readings. The Zephyr S5 includes a Pressure Recalibration function to correct for altitude-related differences and ensure accurate pressure readings.

ETENWOLF Zephyr S5 / S5 Plus Air Compressor – Complete User Manual & Product Guide

Document Overview

Document Overview This article is based on the official product user manual for the ETENWOLF Zephyr S5 / S5 Plus Air Compressor, issued by ETENWOLF — a global inflation tools and lighting gear brand. The manual covers safe operation, button controls, inflation modes, LED work…

Document type: User Manual
Prepared by: Daniel Wright
Published: July 22, 2026
Last reviewed: July 22, 2026
Topics: User Manual

Document Overview

This article is based on the official product user manual for the ETENWOLF Zephyr S5 / S5 Plus Air Compressor, issued by ETENWOLF — a global inflation tools and lighting gear brand. The manual covers safe operation, button controls, inflation modes, LED work light operation, power bank functionality, battery charging, pressure recalibration, troubleshooting, and product specifications. Users are advised to read all safety warnings and instructions before use to reduce the risk of electric shock, fire, or serious injury.

For technical support, contact ETENWOLF at (1) 877-838-0209, Monday through Friday, 8AM–5PM PST, or email [email protected]. Register your product at www.etenwolf.com to receive a 1-year extended warranty.

Product Information

The ETENWOLF Zephyr S5 / S5 Plus is a compact, portable air compressor designed to inflate a wide range of tires and inflatables, enhancing versatility for outdoor adventures. It features a built-in rechargeable battery, an LED work light with multiple modes, and a power bank output for charging electronic devices.

Item	Detail
Brand	ETENWOLF
Model	Zephyr S5 / S5 Plus
Product Type	Portable Air Compressor / Tire Inflator
Display	Center display showing target pressure, actual pressure, battery level, progress bar, and safety alerts
Pressure Units	PSI, KPa, Bar
Charging Input Port	USB Type-C (Input)
Power Bank Output	USB-A: 5V 2A; USB-C: 30W Max (5/9V 3A, 12V 2.5A, 15V 2A, 20V 1.5A)
Charging Time	Approximately 2–2.5 hours (0% to 100%) using 30W PD charger
Included Accessories	Air chuck x1, Presta valve adapter x1, Inflation needle x1, High-pressure tapered nozzle x1, 30W PD charger x1, User manual x1

Key Details

Inflation Modes & Preset Pressure Values

The Zephyr S5 offers six inflation modes accessible via the Mode button. Each mode has a dedicated adjustable pressure range and a factory default value:

Mode	Adjustable Pressure Range	Default Pressure
Car Mode	8 – 50 PSI	35 PSI
Manual Mode	3 – 160 PSI	30 PSI
Pickup Truck Mode	10 – 85 PSI	35 PSI
Ball Mode	3 – 16 PSI	8.5 PSI
Bicycle Mode	10 – 145 PSI	22 PSI
Motorcycle Mode	18 – 55 PSI	30 PSI

The display shows the target input value (smaller, top) and the actual current pressure (larger, bottom). The unit automatically shuts off when the preset pressure is reached. The inflator remembers the last pressure setting and unit preference for the next use.

Quick Start Guide

Remove the pressure hose from its storage channel.
Insert the nozzle clockwise into the valve of the object being inflated.
Long-press the Start/Pause power button for two seconds to power on the unit.
Press the Mode button to select the desired inflation mode (Car, Manual, Pickup Truck, Ball, Bicycle, or Motorcycle).
Press the Unit button to toggle between PSI, KPa, and Bar.
Press the "–" or "+" buttons to adjust the target pressure value.
Press the Start/Pause button to begin inflation.
The unit will automatically stop when the preset pressure is reached.

Note: The Presta valve adapter, inflation needle, and high-pressure tapered nozzle are stored on the back-side storage panel.

Automatic Shut-Off Conditions

3 minutes of inactivity while powered on.
When the battery is fully depleted.
5 minutes of inactivity after being fully charged.
5 minutes of inactivity after being used as a power bank.
When inflating for over 5 minutes but actual pressure remains below 5 PSI.
When inflating for over 5 minutes but actual pressure exceeds 150 PSI.
The inflator cannot be used while it is charging.

LED Work Light

The front-mounted LED work light is activated by powering on the unit and pressing the Light button. Four modes are available:

Bright flashlight
Ultra-bright flashlight
Slow strobe light — light cycles on and off continuously.
SOS signal — 3 short flashes, 3 long flashes, 3 short flashes, repeated in a loop.

The light automatically turns off after 1 hour on the first activation. If manually turned on a second time, it will remain on until manually turned off.

Power Bank Function

The S5 can charge phones, tablets, laptops, drones, and cameras via its USB-A (5V 2A) and USB-C (30W Max) output ports. The unit must be powered on to function as a power bank. After 3 minutes of charging, the display will show only the battery level indicator to conserve power. The inflator will automatically turn off 2 minutes after the connected device is fully charged.

Battery Charging & Indicator

Use the included 30W PD charger for optimal performance. The battery indicator uses four bars, each representing 25% of total capacity:

Indicator State	Charge Level
All bars off / blinking single bar	0% – 5%
One bar	5% – 25%
Two bars	25% – 50%
Three bars	50% – 75%
Four bars	75% – 100%

Fully charge the inflator before first use. The unit will automatically shut off 2 minutes after reaching full charge if left inactive.

Standards & Compliance

As a portable consumer electronic device with a built-in lithium battery and USB Power Delivery output, the ETENWOLF Zephyr S5 is designed and manufactured in accordance with applicable international safety and compliance standards. Users and distributors should note the following relevant regulatory frameworks:

IEC standards for portable electrical appliances and battery safety.
RoHS (Restriction of Hazardous Substances) compliance for electronic components.
REACH regulation compliance for chemical substances in materials.
UN38.3 transportation testing standard for lithium-ion battery cells used in the built-in battery pack.
FCC regulations applicable to electronic devices sold in the United States market.
CE Marking for products distributed in the European Economic Area.

The product manual includes explicit safety warnings to reduce the risk of electric shock, fire, and serious injury. Users are instructed to use only certified ETENWOLF or compatible PD chargers and to double-check target pressure values before inflation to prevent over-inflation hazards.

Validity & Certification Body

This document is the original product user manual issued by ETENWOLF for the Zephyr S5 / S5 Plus Air Compressor. As a user manual rather than a third-party certification report, it does not carry an independent laboratory report number or expiration date. It remains valid for the full product lifecycle of the Zephyr S5 and S5 Plus models.

Field	Detail
Document Type	Product User Manual
Issuing Body	ETENWOLF
Applicable Models	Zephyr S5, Zephyr S5 Plus
Document Validity	Ongoing — applies to all units shipped with this manual revision
Warranty Registration	www.etenwolf.com — 1-year extended warranty upon registration
Customer Support	(1) 877-838-0209 \| [email protected] \| Mon–Fri 8AM–5PM PST

Frequently Asked Questions

Q: Can I use the ETENWOLF Zephyr S5 while it is charging?: No. The inflator cannot be operated during charging. Always disconnect the charger before inflating tires or using the power bank output. The unit will automatically shut off while connected to a charging source.
Q: What should I do if the tire pressure reads lower after I finish inflating?: This is normal. After inflation, the temperature inside the tire gradually decreases to ambient temperature, which causes tire pressure to drop by approximately 0.5 to 1.5 PSI. This is a standard physical effect and does not indicate a malfunction. Inflate to a value slightly above your target if needed to compensate.
Q: How do I switch between PSI, KPa, and Bar on the Zephyr S5?: Press the Unit button (Button 1 on the control panel) to cycle through the three available pressure units: PSI, KPa, and Bar. The selected unit will be shown on the center display.
Q: Why might the pressure reading be 1–3 PSI different at high altitude?: Atmospheric pressure varies with altitude. At higher elevations, this can cause a variance of 1–3 PSI in the inflator’s pressure readings. The Zephyr S5 includes a Pressure Recalibration function (Section 9 of the manual) to correct for altitude-related differences and ensure accurate readings.