Features: The BT5.0 amplifier board has a base plate and top plate, supporting reverse connectionprotection, overvoltageprotection, undervoltageprotection, overheatingprotection, and short circuitprotection. Equipped with volume control andpowerswitch, it is very suitable for making passivespeakersand home audio system on your own. It uses copperDCconnectors and barrier terminals. It can withstand high currents, does not generate heat, and does not damage wires. Large area heat dissipation system, highqualitypower module, which will not overheator stop working during long-term high output. The speaker is connected to a separate grille, making the wiring safer and less prone to short circuits. Specifications: Product Name: Digital Power Amplifier Board Output Power: LeftandRight Channel approx 160W Subwoofer approx 220W Model Number: ZK-HT21 Control Chip:TDA7498E Channels: 2.1 Size:approx 14.5x12.6x2.8cm/5.71x4.96x1.1in Material: Plastic BT5.0 (Unshielded 15M/49ft) Colour:Black Power Adapter: DC15-36V Package Includes: 1 Set x Amplifier Board note: Only the above package content, other product are not included. Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is 0-2cm.