1、BLUETOOTH VERSION 1: The car bluetooth aux adapter uses Bluetooth version 1, which is more compatible, more stable and more responsive than other versions. 2、MEMORY FUNCTION: Bluetooth aux adapter uses memory connection, the first time it is connected, the next time it is started up, it is automatically paired and connected. 3、HANDS FREE FUNCTION: Car bluetooth aux adapter supports hands free calling, freeing up your hands and making clear sound calls. 4、PREMIUM WIRE MATERIAL: The bluetooth receiver cable is made of high resilience TPE material, which can be stretched at will without deformation. 5、ANTI INTERFERENCE: Bluetooth aux adapter is designed with an anti current interference circuit, which effectively isolates the "squeaking" sound caused by the current and makes the sound quality more pure. 1 x Bluetooth Car Receiver    1 x Manual Item Type: Bluetooth Car ReceiverMaterial: Plastic, MetalBluetooth Version 5.1Sensitivity: -42±3dBSNR: >90dbTransmission Method: AAC for SBCBluetooth Latency Less Than 200msFrequency Response 20HZ-20KHZEffective Transmission Distance ≤10m/ 32.8ftMemory Card Supports Up to 32GBBluetooth Indicator Blue LEDFrequency Range 2400- 2483.5MHz