USB Countdown Timer Switch with Rotary Knob – 5V Inline
USB Countdown Timer Switch with Rotary Knob – 5V Inline
Take Control of Your USB Devices – Automatically
Meet your new smart power companion: a compact inline USB countdown timer switch designed for desktops, aquariums, charging setups, and any low-voltage USB-powered device. Simply dial in your desired run time, plug in your device, and let the timer do the rest — automatically cutting power when the countdown ends. No more overcharging, no more wasted energy, no more manual switching.
Key Features
- 24-Hour Adjustable Range – Set shutdown times in 1-hour increments for hours and 5-minute increments for minutes, giving you precise, flexible scheduling.
- Intuitive Rotary Knob – A silver rotary adjustment knob on the black rectangular body makes dialing in your exact settings quick and effortless.
- Clear LED Digital Display – Real-time countdown feedback so you always know exactly how much time remains before power-off.
- 5V Low-Voltage Safe Operation – USB input and output (5V) makes this timer perfectly safe for fans, LED lights, small aquarium pumps, charging cables, and other low-voltage devices.
- Compact & Space-Saving – The main control unit measures just ~7 cm × 2.7 cm × 1.6 cm, with attached cables of 15 cm and 10 cm for flexible, clutter-free placement.
- Prevents Overcharging & Saves Energy – Automatically cuts power after the set time, protecting your devices and reducing unnecessary electricity consumption.
Specifications
| Power Supply | USB Powered (5V) |
| Timer Type | Electronic Countdown Timer |
| Adjustment Range | Up to 24 hours |
| Hour Increment | 1-hour steps |
| Minute Increment | 5-minute steps |
| Control Body Size | ~7 cm × 2.7 cm × 1.6 cm |
| Cable Lengths | 15 cm (input side) / 10 cm (output side) |
| Display | LED Digital |
| Country of Origin | Made in Mainland China |
Perfect For
- Aquarium lights, filters, and small pumps
- Desktop fans and USB-powered LED strips
- Charging smartphones, tablets, and earbuds (with auto-stop)
- Plant grow lights and terrariums
- Any USB-powered device that benefits from automated scheduling
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Learn more: ENERGY STAR product efficiency guidance
Frequently Asked Questions
Q: What devices can I use with this USB countdown timer switch?
A: This USB countdown timer is compatible with any USB-powered device operating at 5V, including desktop fans, LED light strips, aquarium pumps, phone chargers, grow lights, and more. It is ideal for any low-voltage USB setup where you want automated power-off control.
Q: How precise is the countdown timer setting?
A: The timer offers up to a 24-hour countdown range. You can set hours in 1-hour increments and minutes in 5-minute increments, giving you accurate and flexible scheduling to match your exact needs.
Q: Is this timer easy to set up and use?
A: Yes — simply plug the input cable into your USB power source, connect your device to the output cable, and use the rotary knob to dial in your desired countdown time. The LED digital display provides real-time feedback throughout the countdown, so setup takes only seconds.
Q: Will this USB timer prevent overcharging my devices?
A: Absolutely. By automatically cutting power once the countdown reaches zero, this inline timer switch stops power delivery at the set time, helping to protect battery-powered devices from extended charging sessions.
Production & Packaging Notice
To maintain high stock availability and fast shipping times, our items are sourced from multiple verified manufacturing facilities. While the core quality, materials, and product specifications remain identical, you may notice slight variations in the packaging design, manufacturing origin, or the wording of the printed instructions.