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3. Supports recording. Recording only supports operation in TF mode or USB mode. ( and hold the MODE button to recording, and hold the MODE button again to cancel recording and play the recording file; Exit recording mode by long pressing the pause button. When recording, a storage device such as a USB flash drive or TF card needs to be connected) 1. Bluetooth version 5.0 4. Support power-off memory 2. Support calling ( and hold the pause button to answer the call when there is an incoming call) 5. The power supply voltage supports DC 8v-24V and the current is between 1-4A.