Features 1、Product Functions: Support APP connection, password setting, prompt sound volume adjustment, sleep aid, sound effect selection, U disk playlist, indicator brightness adjustment. 2、10 Tones Selection: 10 kinds of sounds create unique natural sound scenes, create a quiet ambiance, quickly calm the mood, and achieve deep sleeping. 3、Solid State Capacitance: 9 solid state capacitors are used to ensure better filtering and energy storage effect, increase the spacing for cooling, with better channel separation. 4、High Efficiency: The Bluetooth power amplifier board has integrated large inductance, sufficient current and power, and better filter circuit to ensure efficient performance. 5、Good Heat Dissipation: The heat sink is close to the shell to assist in heat dissipation, the bottom ventilation design ensures more sufficient heat dissipation, safe in operation. Specification Item Type: Power Amplifier Board Model: ZK R502H Material: PCB, ABS Basic Parameters: Audio Output: Left Channel 50W, Right Channel 50W Suitable Speaker: 10-50W, 4-8Ω Package List 1 x Mainboard 2 x Cover Plates 8 x Screws 4 x Screw Copper Pillars 4 x Copper Pillars 3 x Knobs 1 x Heat Sink 1 x Screwdriver