DuaFire Wireless Bluetooth 4.0 A2DP Car Home Audio Music Streaming Receiver Adapter (Bluetooth 4.0) Bluetooth V4.0. Bluetooth Profiles: A2DP & AVRCP. Bluetooth Distance: up to 10 meters. 3.5mm stereo audio output, LED indicator, One touch connect button. Power supply: Inner Li-Battery charging via Micro USB cable. Wireless music receiver connects to 3.5mm headphone jacks. Operation time: up to 8 hours. Package Included: 1x Car Bluetooth Stereo Audio Music MP3 Receiver, 1x 3.5mm Audio Cable, 1x 3.5mm Audio Adapter, 1x USB Cable, 1x User Manual. Size: 1.97 inch x 1 inch x 0.43 inch.