BluetoothBluetooth V5.0 Automatically reconnect to the paired Bluetooth device when powered on If no device is connected for five minutes,it will automatically shut down Built-in 250MA rechargeable battery,environmental protection and energy saving. About 16 hours of music playback time when fully charged Support bluetooth stereo music DSP technology Voice broadcast caller number Double tap the phone key to wake up the phone SIRI The Bluetooth playback distance is within 10 meters of the barrier-free. Size: 55*35*11.5mm 1.[Bluetooth 5.0 Receiver] SONRU Bluetooth adapter turns non-Bluetooth devices into wireless devices through 3.5mm AUX adapter,easy to operate. Built-in upgraded Bluetooth 5.0 chip,the Bluetooth reception range can reach 33 feet,the connection is stable,and the transmission speed is fast. 2.[Intelligent Noise Cancellation] Bluetooth car adapter adopts the latest CVC8.0 noise reduction and DSP technology,which can cancel echoes and block intrusive background noises (such as wind,traffic or crowds),providing clear sound and voice transmission. 3.[Full-featured] With hands-free,stereo music and wake-up siri functions,support to adjust the music volume,switch the previous song and the next song. 4.[Compatibility] Our bluetooth receivers are compatible with most bluetooth enabled devices,such as smartphones,tablets and laptops,and can connect to cars,old home audio systems and wired headphones to help you enjoy wireless functionality. 5.[Quick Charge] With the included typeC charging cable,it only takes 2 hours to fully charge the Bluetooth adapter.