1. Bluetooth version 5.0. 2. The amplifier chip uses TPA3116. 3. Support calls ( and hold the pause button to answer the call when a call comes in). 4. Support recording. Recording only supports TF mode or USB mode. ( and hold the MODE button to start recording, and hold the MODE button again to cancel recording and play the recording file; and hold the pause button to exit the recording mode. When recording, you need to connect a storage device, such as a USB flash drive or TF card) 5. Support power-off memory. The power supply voltage supports DC 8v-24v, and the current is between 1-4A. Can be directly connected to the speaker, with power amplifier and decoding functions. Support song formats MP3 / WAV / APE / FLAC Main functions MP3/USB/TF/LINE IN/FM/BLUETOOTH/remote control. The total power is 100W, 50W for each of the two channels. Support folder selection and playback. Button FD+ is folder Button FD- is the previous folder Color:Black Material:plastic Package Contents: 1 * Decoder Board 1 * remote control (without CR2025 battery) 1 set * cables Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.