1.Operating Voltage: 2.5V-5.5V.
Note : Do not exceed the supply voltage 5.5V, do not reverse the positive and negative power supply.
2. Speaker: 4 -8ω. Speaker Power :2-8W.
3. Can be powered by 5V USB, or cell phone charger USB port 5V, Lithium battery power also.
4. High efficiency of 90%, 4ω load and 5V power supply conditions, can provide 3W ( left channel ) +3 W ( right channel ) output power. The efficiency of power amplifier Class A and Class B is only at 30%, Class D amplifier is respected in today's green trend.
5. Class D amplifier efficiency is very good, the sound quality will be not affected by temperature, and it works still very well even if without additional heat sink.
6. Built-in noise canceling circuit, short circuit current protection and over-temperature protection.