2-Channel Audio Amplifier Mini HiFi Digital Class D Amplifier Do Speaker Ear: 12x8 cm/4.7x3 inches With Bluetooth 42 chip, the signal is more stable Power supply filter capacitor uses five 470 UF/25V electrolytic capacitors Red-gray ring is used do special power discharge to ensure clear and powerful sound Input method: analog input and Bluetooth function When two modes are entered simultaneously, priority ma Bluetooth input After Bluetooth connection, the RCA input is automatically disconnected; When analog input is required, turn off Bluetooth function on mobile phone before turning on - Inner mesh panties Working method: Class D. Resting Current: 50mA Working efficiency: 90% Rated output power: 2 * 100 W. Frequency Response: 20 Hz do 20 kHz Operating voltage: DC18V do DC24V Maximum Output Current: 4A Potentiometer function: from bass/volume control The package includes: 1 piece Bluetooth digital amplifier