Listen to internet radio or the music stored on your smartphone or tablet PC on your audio system (wirelessly). Suitable for all Bluetooth enabled sound sources such as iPhone, Android phone, iPad, etc. Works with all audio installations, iPhone dock or radio/CD player with aux-in, line-in or mp3-link connection. Supports A2DP Stereo Bluetooth for music in CD quality. Bluetooth Frequency: 2.4G ~ 2.48G Hz ISM band Bluetooth Version: V2.1+EDR, class II, CSR chip Supported profiles: A2DP, AVRCP Support Multiple pair: up to 8 devices Range: Up to 10m open field Light Indicator: 2 color LED (Red/Blue) Interface Audio output: DC3.5 male Power: Mini USB or battery Battery: Li-ion 140 mAh - Stand-by time: up to 6 hours - Battery life: up to 6 hours - Charging time: 2 hours Energy saving: automatic switch-off if no connection within 10 minutes Weight: 10g size (L x W x H): 60 x 25 x 9 mm Operation temperature: -10 degrees ~ +55 degrees Storage temperature: - 20 degrees ~ +60 degrees