Dimensions: 3.50 in x 0.75 in x 0.75 in (8.9 cm x 1.9 cm x 1.9 cm)Compact and portable designWavelength: 532nmPower: 5mWWorking voltage: 3VPowered: 1 x CR2 battery (included)Comes with strap <img src="http://112.74.112.28/down/products/210017/210017_000.jpg">