Features: *USB Powered Convenience: This countdown timer features a USB interface, allowing for easy plug-and-play setup, making it suitable for various devices and make sure a hassle-free experience. *Intuitive Digital Display: Equipped with a digital screen that shows the timing progress, it offers an easy-to-read format that helps you track the countdown at a glance. *Compact and Portable: Designed with a small footprint, this timer is lightweight and easy to carry, making it Perfect for use in different locations, including home and office settings. *Customizable Timing Options: With 24 hours of adjustable timing in hours and minutes, users can easily set their desired countdown by simply turning the knob for precise control. *Safety Features: Operating at a low voltage of 5V, this timer ensures safety during use, providing peace of mind while controlling appliances such as fish tanks and other electronic devices. Specifications: *Product Name:USB Countdown Power Off Switch *Material:Plastic + Copper wire *Size:7*2.7*1.6CM *Color:Black *Interface: USB male and female *Voltage: 5V *Time: 24H *Hours threshold: 1H *Minutes threshold: 5MIN Package Content: 1 x USB Countdown Power Off Switch Note: 1. The real color of the item may be slightly different from the pictures shown on website caused by many factors such as brightness of your monitor and light brightness. 2. Please allow slight manual measurement deviation for the data. USB 24H Adjustable Timing Power Off Switch Fish Tank Automatic Control Line [USB POWERED CONVENIENCE] Enjoy effortless operation with a USB interface that allows for easy and play setup, compatibility with various devices for a seamless experience. [INTUITIVE DIGITAL DISPLAY] The clear digital screen displays the countdown progress in an easy-to-read format, allowing you to monitor your timing at a glance, making it user-friendly for all ages. [COMPACT AND PORTABLE] With its lightweight design and small footprint, this timer is perfect for use in multiple locations, whether at home or in the office, offering flexibility wherever you need it. [CUSTOMIZABLE TIMING OPTIONS] Easily adjust the countdown timer up to 24 hours using the intuitive knob control, allowing you to set precise timings for your appliances with just a simple turn.