Item Type: Bluetooth AdapterMaterial: ABSBluetooth Version: 5.0Charging: DC 5VBuilt in Lithium Battery: 300mAhWorking Time: 6 hoursCharging Time: 2 hoursOutput: 3.5mm Audio OutputPackage List1 x Bluetooth Adapter1 x Audio Cable1 x Charging Cable1 x Manual1WIRELESS AUDIO TRANSMISSION: This 2 in 1 wireless adapter supports automatic search and connection of Bluetooth devices to achieve wireless audio transmission. Support audio equipment with audio input interface to realize wireless audio reception and transmission. 2PURE SOUND QUALITY: This Bluetooth 5.0 transmitter receiver has built in AEC noise cancellation and ANC noise cancellation circuits, gorgeous stereo sound, and purer sound quality. Built in enhanced signal transmission circuit, fast and stable connection. 3SMART COMPATIBILITY: This 3.5mm wireless transmitter is compatible with dual lossless audio formats. Smart compatible, for Android, for IOS system mobile phones and for PAD, as well as all Bluetooth audio devices. Support auxiliary input output. 4SIMPLE AND CONVENIENT OPERATION: This 2 in 1 Bluetooth adapter is easy to connect, without any cumbersome drivers and downloading applications. Automatic memory connection function, simpler operation and more convenient connection. 52 IN 1 WIRELESS ADAPTER: This 3.5mm 2 in 1 wireless adapter supports the one to two function in the activated state and supports stereo in the transmission mode. Built in battery, battery life is long.