1、OUTPUT: Power amplifier board using Bluetooth 5.0, stable connection, with 3POUT output: can be external to the amplifier board, 3P middle is the sound ground, the two sides are R L. 2、INPUT: Power amplifier board module using 3.5AUX input: when plugged into the 3.5 sound cable is AUX input mode (Bluetooth disconnected), 3.5 headset holder can not change the line indiscriminately because this has the function of detection. 3、POWER REQUIREMENTS: Digital sound amplifier board voltage DC DC voltage 3.7‑5V, the voltage can not be higher than 5V, current 2‑3A,. 4、SPEAKER REQUIREMENTS: Sound amplifier board when the power supply is 5V 2V: (Satellite) left and right channel speakers: choose 4 Ohm 5W full range speakers 5、TRUE WIRELESS STEREO BOX: If you use the function of the box you must use two Bluetooth modules, a module can only ordinary Bluetooth function, when connected to true wireless stereo a board is mono; when disconnected it single board is stereo. Item Type: Power Amplifier Board Material: PCB Bluetooth: Bluetooth 5.0 Voltage: 3.7V 5V Speaker. Working Voltage Lithium 3.7V, or Regulated Power Supply DC 4.5‑5V Current (1A When Connected to A Speaker, 2‑3A or so When Connected to Two Speakers) Lithium Powered Speakers with 4 Ohms 3W and 3W, Regulated Power Supply 5V Speakers with 4 Ohms 5W and 5W 1 x Power Amplifier Board 1 x Power Cable 2 x Sound Cable