Product Description Patent NO: 2014207630799 REACH NO: ATT 1506300027 H Sensor switching when you open bag and switches off automatically lasting for 15 seconds LOGO: 1C or 2C logo imprint on body Batteries only need changing after 3000 uses, 2 pre-installed button cells Product Features Model Number BTS- JM 01 Size 4*4.5*2.5 cm Materials ABS Color Red, blue, yellow, white,customized Certification CE, ROHS, Reach http://www.wirelessspeakerchina.com