Elecsmart USB/ AA Battery Powered Creative Voice Sound Activated Wood LED Digital Alarm Wooden Clock Despertador with Temperature Display Adjustable Brightness(Black Wood + Blue Light) Fashionable and portable digital desktop alarm clock for home & office Produced with natural material bringing you a healthy and fashionable low-carbon life, and number dispaly is available at dark night It also can work by voice when you clap your hands, or make some equivalent noise. Sound control switch regulate freedom. Daul Power Supply: 4 AAA dry batteries or DC 5V/500mA SIZE: 6*6*6cm, Weight: 100g