Grok’ EE.) Err Product Parameter: Operating Voltage: DC Output Power: 50W*2 Signal-Noise Ratio: 102dB Protection Function: reverse polarity protection, over-voltage, under-voltage, over-heat, short-circuit Component instruction Capacitor Bluetooth Multichannel output pews ES Right channel oui Reverse polarity protection Audio input DC socket B52. mim SKU:200338 Wiring Glued 1. Choose mods This amplifier board has 2 mods, Bluetooth mode and LINE IN mode.