With in-built rechargeable battery like your smart phone, its portable to use and provide a sleek and stylish look in any space. Alarm is easy to use and set. Automatic dimmer between 9pm to 7am. 5/7 Days alarm setting. Sound activated led display or permanently stays on. Display time, date or temperature alternatively, or can be set on time display only. Technical: Displays time, date and temperature alternately. Sound activated display or permanent display settings. Alarm with snooze. Automatic dimmer function (the clock will dim 2/3 automatically between 21:00 -7:00). 12/24 Hours or celsius/fahrenheit format can be selected. Internal battery included to keep your custom settings in case of sudden power cut. Power supply: built-in rechargeable lithium battery for a wire-free display. 5V-500ma ac/dc uk, eu or us charging wall plug adapter included. Material: mdf wood box with beechwood-effect veneer finish. Led display colour: green. Product size: 150 * 45 * 100mm. Product weight: 4