Item Type: Power Amplifier Board Material: Aluminum alloy Bluetooth Version: 5.0(15m without shielding) SNR: >90dB Input Method: AUX and Bluetooth Number of Channels: Left and right dual channel (stereo) Applicable Power Supply: DC9-24V/3A or more (24V battery pack cannot be connected) Adaptable Speaker: 15-100W,4-8 Power Supply Voltage: 12V-8/12W+12W,4/20W+20W 15V-8/18W+18W,4/30W+30W 19V-8/30W+30W,4/30W+30W 24V-8/40W+40W,4/50W+50W Protection Mechanism: Overheat, overcurrent, short circuit protection Size: Approx. 89 x 60 x 21mm / 3.5 x 2.36 x 0.83in1Four Types of Protection: This module has four types of protection functions, including overheat protection, circuit protection, overvoltage protection and undervoltage protection. 2High and Low Adjustment: Our module supports independent adjustment of high and low tones, Bluetooth and AUX audio input, and 50W for left and right channels. 3Small Distortion: This module has the classic two band tonality with small distortion and wide adjustment range, which is very easy to use. 4Easy to Install: Our module is very easy to install, just follow the guidelines and the correct operation process to install successfully, also very friendly for novices. 5Well Replacement: Designed reasonably, it is a very nice replacement accessory that can directly replace the old or damaged parts to get higher strength. 1 x Stereo Amplifier 2 x Aluminum Alloy Plate 3 x Knob 1 x Heat Sink 1 x Fitting 1 x Screwdriver 8 x Screw 8 x Studs