Item Type: ZK 502MT Power Amplifier Board Material: Printed Circuit Board Purpose: Digital Power Amplifier Board Model: ZK-502MT BT Version: 5.0 Input Method: AUX and BT Number of Channels: Left and Right Dual Channels (stereo) BT Version: 5.0 (Unobstructed, 15 Meters) Signal to Noise Ratio: >90 dB Adapter Power Supply: DC 9-24 V/3A or Above (24V Battery Pack is Not Allowed) Adapted Speakers: 15W-100 W, 4Ω-8Ω Power Supply Voltage: 12V-8 Ohms/12W+12W, 4 Ohms/20W+20W 15v-8 Ohms/18W+18W, 4 Ohms/30W+30W 19v-8 Ohm/30W+30W, 4 Ohm/40W+40W 24v-8 Ohm/40W+40W, 4 Ohm/50W+50W Protection Mechanism: Overheating, Overcurrent, Short Circuit Protection 1、The digital amplifier module is equipped with wiring blocks and DC 2.1mm socket which is compatible with most laptop's power port. 2、Inbuilt filter capacitor makes it available to process the sound signal. Knob potentiometer design makes it convenient to adjust the power ON/OFF, V+/V?. 3、You can directly connect this BT speaker amplifier board with wireless BT 5.0. And it's compatible with multiple kinds of speakers. 4、Two channels 20W/30W/50W amplifier board work with various speakers (4 to 8 ohm), supporting BT stereo audio input AUX audio input. 5、The BT Amp is designed with acrylic protective shell, reverse connection protection, over voltage protection, under voltage protection, over temperature protection, short circuit protection. Self recovery overheat protection. 1 x ZK 502MT Power Amplifier Board 1 x Screwdriver 8 x Screws 1 x Round Connector 4 x Brass Terminal 4 x Brass Connecting Rod 2 x Acrylic Board 3 x Knob 1 x Square Block