Feature:1. The amplifier module is equipped with a terminal block and a DC 2.1mm socket, which is compatible with most laptop power ports. Can directly connect to wireless Bluetooth 5.0. and compatible with a variety of speakers.2. The built in filter capacitor of this digital power amplifier module makes it available for processing sound signals. Knob potentiometer design, convenient to adjust power ON and OFF, V+ and V.3. Two 20W, 30W or 50W power amplifier boards are equipped with various speakers (4 to 8 ), and support Bluetooth stereo audio input and AUX audio input.4. Adopt acrylic protective shell design, with reverse connection protection, overvoltage protection, undervoltage protection, over temperature protection, short circuit protection. Self recovery overheating protection.5. This bluetooth speaker power amplifier board has no POPs sound when powering on, skipping songs and pausing. It is widely used in refitting speakers, power amplifier equipment, and car Bluetooth equipment.Specification:Item Type: Power Amplifier BoardMaterial: PCBPurpose: Digital Power Amplifier BoardModel: ZK-502LBluetooth Version: 5.0Input Method: BluetoothNumber Of Channels: Left and Right Dual Channels (stereo)Bluetooth Version: 5.0 (Unobstructed, Approx. 15m/49.2ft)Signal To Noise Ratio: >90 dBAdapted Speakers: 30W-200 W, 4-812V-8 /12W+12W, 4 /20W+20W15V-8 /18W+18W, 4 /30W+30W19V-8 /32W+32W, 4 /45W+45W24V-8 /38W+38W, 4 /50W+50WProtection Mechanism: Self Recovery Overheating Protection, Self Recovery Short Circuit Protection.Package List:1 x Power Amplifier Board 1 x Screwdriver9 x Screw4 x Brass Connecting Rod2 x Acrylic Board1 x Knob1 x CableNote:The input voltage cannot exceed 24V, otherwise the audio amplifier module will be damaged.