Specification:
Material: PCB
Bluetooth: 5.0
Voltage: 3.7V to 5V
Current: 1.5A to 2A
PCBA size: approx. 40 * 34 * 9cm / 15.75 * 13.39 * 3.54in (including terminal)
Package Weight: approx. 40 g

Package list:
1 * Power Amplifier Board
1 * Cable

Pay Attention:
1) Red 2P seat BAT is connected to the power supply positive DC 3.7V to 5V+, GND is connected to the negative pole; white 2P seat is connected from the bottom to the upper L O /L O+, and the white 2P is R O /R O+.
2) Working voltage lithium battery 3.7V, or regulated power supply DC DC 4.5 to 5V, current (600 to 700MA when connected to a speaker; 1.5 to 2A for two speakers). Lithium powered speaker with 4 ohms 3W+3W, voltage regulator Power 5V speaker with 4 ohms 5W+5W. If the current is not enough, there will be a jump or Bluetooth instability, the motherboard will always restart or the sound quality is not good / broken / distortion and other bad phenomena (if you have this problem, please check your power); The voltage should not be higher than 5V, otherwise the main chip and the amplifier IC and related components will be damaged. Please pay attention.
3) Audio output: 3P block OUT audio output can be modified for external power amplifier, the middle is audio ground, left and right are L and R respectively.