Spec:
Item Type: Power Amp Module
Voltage: 3.7V-5V
Current: 1.5A-2A
Power: 5W + 5W
For Bluetooth: 5.0
Speaker: 4Ω/3W (not included)
Screw Hole Diameter: Approx. 1.6mm / 0.1in
Size: Approx.
40mm / 1.6in
22mm / 0.9in
27mm / 1.1in
34mm / 1.3in

packing list:
2 x Power Amplifier Board
6 x Connection Line

Note:
1) B+ is connected to the positive pole of the power supply from DC3.7V to 5V+, and N‑ is connected to the negative pole;
2) Working voltage lithium battery 3.7V, or regulated power supply DC 4.5‑5V DC, current (600‑700MA when connected to one speaker; 1.5‑2A when connected to two speakers. Lithium battery powered speaker with 4Ω3W+3W, regulated power supply 5V /2A, speaker with 4 ohms 5W+5W. If the current is not enough, there will be skipping or for Bluetooth instability, the motherboard will always restart or the sound quality/broken sound/distortion, etc. (If there is this problem, please check your power supply) ,The voltage cannot be higher than 5V, otherwise it will damage the main chip, power amplifier IC and related components, please pay attention
3) White 2P seat SP‑/SP+ from bottom to top L‑O‑/L‑O+ connected to speaker 1; white 2P seat SP‑/SP+ from bottom to top R‑O‑/R‑O+ speaker 2