ER2842B Features Can directly connect with a Mini USB or 3.5 mm audio cable to convert a common sound box into a Bluetooth sound box Supports Bluetooth 2.1+EDR technology Compact size for ease of carrying General Specs Brand & Model TS-BT35A05/TS-BT35F01  Bluetooth V2.1 + EDR Bluetooth Protocol AVRCP/A2DP Frequency Response 2.4GHz-2.4835GHz Transmission Range Up to 10 m Charging Input Voltage DC 5V Package Details Weight: 42.80 g Size: 11*7.5*2 cm