Precise 24-hour time setting: The integrated digital USB timer supports flexible countdown adjustment of up to 24 hours for a wide range of USB-powered devices. Customize the shut-off time for fans, lights, chargers or small appliances. Automate power control and manage daily energy usage. Materials and durable construction: This pack of 2 USB countdown timer switch cables is made of copper conductors and durable outer sheathing. Energy management: With the USB countdown timer switch cable, devices are automatically switched off after the preset time, reducing idle power consumption. Simply plug the timer cable into a standard USB port, connect your device and set the desired countdown on the digital display. No complicated programming or extra software is required, suitable for use at home, in the office, dorm rooms or while traveling with a wide variety of 5V USB-powered products. Compact, portable and versatile: Each USB timer cable measures approximately 20 cm. Offers a tidy, space-saving design for desktops, nightstands and travel bags. Color: Black Material: Plastic. Package Contents: 2 * USB Countdown Timer Switch Cable. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm. Only the above package content, other products are not included.