SINCEDA Nightlights Temperature Battery Operated Optically Controlled Liquid Crystal Device Alarm Clock (White ) Large LCD displays time ,calendar, temperature, alarm status Dimension: 13.8 cm * 7.5cm * 4.8cm Battery Operated Alarm Clock -- Without thinking about power goes out and wires, it can be placed whatever room you need, perfect for travel and beside use. Requires 3 AAA Zinc-carbon batteries (Not INCLUDED)