Item Type: Power Amplifier Board <br>Material: PCB <br>Bluetooth: Bluetooth 5.0 <br>Voltage: 3.7V 5V <br>Speaker. <br>Working Voltage Lithium 3.7V, or Regulated Power Supply DC 4.5?5V <br>Current (1A When Connected to A Speaker, 2?3A or so When Connected to Two Speakers) <br>Lithium Powered Speakers with 4 Ohms 3W and 3W, Regulated Power Supply 5V Speakers with 4 Ohms 5W and 5W1、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. <br>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. <br>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,. <br>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 <br>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.1. B + connected to the power supply positive DC3.7V to 5V +, GND ? connected to the negative terminal. 2. <br>2. working voltage lithium 3.7V, or voltage regulator DC DC 4.5?5V, current (connected to a speaker 1A; connected to two speakers 2A?3A or so. If you use 3.7V lithium battery, please ensure that the lithium battery and discharge can reach 2A, some lithium batteries have voltage but the current is unstable or can not meet the requirements, please use caution, otherwise it will always restart or sound quality is not good sound or distortion and other bad phenomena (if you have this problem, please check your power supply); voltage can not be higher than 5V, otherwise It will damage the main chip and amplifier IC and related components, please note. <br>3. SP? SP+ from the bottom to the top L?O? L?O+ connected to the speaker. <br>4. If you use 3.7V lithium battery, please ensure that the lithium battery and discharge can reach 1.5A, some lithium batteries have voltage but the current is not stable or can not meet the requirements, please use caution; speaker please choose to use 4 ohms 3W. <br>5. In the KEY signal foot with a light touch switch or wire and GND ground touch, is the timed wire service mutual scanning connection. Note that it is a touch, not a long press to short circuit.<p>1 x Power Amplifier Board</p><p>1 x Power Cable</p><p>2 x Sound Cable</p>