1. The power supply of this power amplifier board requires 12-24V 3A DC regulated switching power supply (testing with battery and charger, transformer and AC switching power supply is not guaranteed)    2. 24V 3A power supply, the output power can reach up to 30W 8 ohm continuous power It can be connected to 30W bass + 10W tweeter (4 ohm speaker may be protected) (full volume may also be protected)    3. After the test is completed, the battery can be connected to the power supply after receiving the goods (the 24V battery is not allowed, because the battery may exceed 25V after being fully charged, and the capacitor on the board is 25V, there is a risk of explosion )    4. It is not possible to connect the 24V battery of a large truck, because the charging voltage reaches 28-32V when the truck is on fire, and it will burn         Maximum Power Per Channel: 30W    Model Number: Bluetooth 5.0 Power Amplifier Board    Channels: Mono Stage Power Amplifier Board    colour:Green    Material:plastic        Package Contents:    10 x Amplifier Board