Note: before purchasing, please check whether the mobile device can support LDAC? Does the decoder support 24bit, 96k? The LDAC function results of some mobile phones are as follows: Support: Huawei mate30, Xiaomi 9pro, etc Not supported: iPhone, low version Android phone, etc. If you don't support LDAC, other protocols can be used. It doesn't affect normal use, but you can't use LDAC protocol. View method: Android phone into the developer mode, drop down to view Function Description: 1. Use csr8675 Bluetooth audio board ,Bluetooth 5.0, supporting aptx, aptx HD, LDAC, using external antenna, better effect 2.The highest sampling rate can support 96k. (LDAC format) 3. USB type-C power supply, simple operation, work after power on! 4. The board has integrated LED indicator light! [led Bluetooth is not connected with slow flash, pairing mode is fast flash, Bluetooth is connected with constant light] 5. Power on and enter the pairing mode automatically. The pairing mode lasts for 3 minutes. After 3 minutes, restart and enter the pairing mode or press the play button for 3 seconds to enter the pairing mode! Key Description: Bluetooth mode short press play pause, long press 3 seconds to enter pairing mode Parameter Description: 1. Bluetooth Name: Bluetooth A107 2. Power supply: USB type-C 5V power supply, current 500 MA 4. Bluetooth distance: 10M 5. Board size: 73 (mm) X80 (mm) [excluding module antenna and structure protruding part] 6. Accessories: 2.4G folding antenna