Features: brand new and high quality Connect bluetooth-compatible devices at once to listen to music, make phone calls, and more. It can fast and stable transmission without tangling. The bluetooth-compatible car adapter allows hands free calling with built in microphone. Noise cancellation technology provides excellent call quality. Easy to pair with bluetooth-enabled smartphones, laptop, tablet, etc. Bluetooth-compatible transmitter pair to old TV, PC, and transmit the audio to your bluetooth-compatible headphone or speaker. Specifications: Material:ABS Color:Black Size:52x52mm/2.04x2.04in Bluetooth-compatible Version: V 5.0 Output Interface:3.5mm/0.14in Jack Charging Power: Micro USB 5V/0.5A Battery Capacity:250mAh Charging Current:About 200mA ; Charging Time:About 2Hours Working Current:RX22MA TX35MA Operating Range: About 33 feet without Obstacle(About 10 meters accessibility) Supporting Agreement:RX:A2DPAVRCPHFP TX:A2DP Working Frequency:2.402GHz -2.480GHz Note: Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Package includes: 1x Bluetooth-compatible Transmitter&Receiver 1x 3.5mm Audio Cable 1x USB Cable