Precise 24-hour time setting: The integrated digital USB timer supports flexible countdown adjustment of up to 24 hours compatible with a wide range of USB-powered devices. Customize the shut-off time compatible with fans, lights, chargers or small appliances, making it easy to automate power control, avoid overcharging and conveniently manage your daily energy usage. High-quality materials and durable construction: This pack of 2 USB countdown timer switch cables is made of selected copper conductors and robust outer sheathing. Energy-efficient and safe working: 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 clear digital display. No complicated programming or extra software is required, making it suitable compatible with 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, offering a tidy, space-saving solution compatible with desktops, nightstands and travel bags. Color: Black Material: plastic Package Contents: 1*Timer switch Only the above package content, other products are not included. 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.