The Uni-Com Countdown Timer allows you to plug in standard UK 3 pin plug, USB-A or USB-C charging cables. Safely charges devices without the risk of over charging of devices eg. mobile phones, laptops, batteries and power banks. You can also choose how long an appliance is switched on for eg. electric heaters, fans, electric blankets and lamps. Countdown can be set to one of 7 options: 15 mins, 30 mins and 1/2/4/6/8 hours. The socket will switch off the device/appliance after the countdown time is complete. Simple to use, plugs into any 13A mains socket.