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 transmitter receiver allows hands free calling with built in microphone. Noise cancellation technology provides excellent call quality. Easy to pair with bluetooth-enabled smartphones, laptop,etc. Small and exquisite to carry with you. Specifications: Model number: AC692X Bluetooth-compatible Version: V5.0 Support Protocol: RX: A2DP, AVRCP, HFP TX: A2DP Working Frequency Band: 2.402GHz -2.480GHz Power Level: Power Level 2 (Class II) Audio Coding: SBC Working Current: RX22MA TX35MA Built-in Battery: 250MAH Charging Current: About 200MA Charging Time: About 2 hours Life Time: RX12H, TX7H Bluetooth-compatible Distance: >10M (Barrier-free ) Charging Method: Micro USB 5V/0.5A Input/Output Connection Mode: AUX Interface Compatible: Android, IOS system mobile phone and PAD, and Bluetooth-compatible speak 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