2 in 1 Wireless bluetooth transmitter and receiver , 3.5mm bluetooth adapter AZ10491 Feature:***** Support audio equipment with audio input interface to realize wireless audio reception and transmission.***** Supports automatic search and connection of Bluetooth devices to achieve wireless audio transmission.***** Built-in AEC noise cancellation and ANC noise cancellation circuit, gorgeous stereo sound, more pure sound quality.***** Built-in enhanced signal transmission circuit, faster connection, more stable and continuous tone.***** Compatible with dual lossless audio formats.***** Support AUX IN/OUT.***** Automatic memory connection function, simpler operation and more convenient connection.***** Built-in battery, long battery life.***** Smart compatible, Android, IOS system mobile phones and PAD, and most Bluetooth audio devices.***** The product connection is simple, without any cumbersome driving and downloading APP;***** The launch state supports the one-to-one function.***** Support stereo sound in transmit mode.***** Size: 100x60x25mm***** Battery: 300mHa***** This product is connected to a Bluetooth device (such as a mobile phone), and uses the AUX interface to input audio to other audio devices without Bluetooth function.***** This product uses AUX to connect with the playback device, and transmits audio to the Bluetooth receiving device (such as Bluetooth headset) via Bluetooth.