Elecsmart Wood Grain Clock LED Desk Alarm Clock Time Temperature Date - Sound Control - Latest Generatio( Blue LED Black Wood ) 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/503mA Dimension:21* 9*4.5cm Weight:403g