Item Type: Bluetooth Car Receiver Material: Plastic, Metal Bluetooth Version 5.1 Sensitivity: -423dB SNR: >90db Transmission Method: AAC for SBC Bluetooth Latency Less Than 200ms Frequency Response 20HZ-20KHZ Effective Transmission Distance 10m/32.8ft Memory Card Supports Up to 32GB Bluetooth Indicator Blue LED Frequency Range 2400-2483.5MHz Package List 1 x Bluetooth Car Receiver 1 x Manual 1BLUETOOTH VERSION 5.1: The car bluetooth aux adapter uses Bluetooth version 5.1, which is more compatible, more stable and more responsive than other versions. 2MEMORY 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. 3HANDS FREE FUNCTION: Car bluetooth aux adapter supports hands free calling, freeing up your hands and making clear sound calls. 4PREMIUM WIRE MATERIAL: The bluetooth receiver cable is made of high resilience TPE material, which can be stretched at will without deformation. 5ANTI 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.