Compatible with most devices that may utilize headphones LED power indicator for power on and charging 360-degree sound field integrates a cone design with a custom-built speaker to project sound in all directions Product Features Model Number BTS-JM 013XB Size 50*50*35 mm Materials ABS Color Red, black, blue, white, yellow,customized Certification CE, CE EMC, CE LVD, ROHS,California Proposition 65 requirement http://www.wirelessspeakerchina.com