Audio input: 3.5mm stereo input, USB audio input, Bluetooth 5.0, RCA input, TF card, USB input (compatible with computer, mobile phone, OTG) Features TPA3116 chip, maximum power output of 50W, actual output power of 30W*2 at 12V 5A, 4 ohms Hi-Fi sound quality with clear and crisp audio, no audible noise; circuit optimized by engineers to ensure noise-free performance even at maximum output Long press power switch to turn on Output power: 50W + 50W Power requirements: DC 9V–24V Bluetooth range: Up to 12 meters (in open space without obstacles) Bluetooth version: 5.0 Speaker impedance: 4Ω–16Ω Color: Black / Wood color / Silver Gray Material: Plastic Package contents: 1 x Digital Audio Power Amplifier Note: Light reflection and display differences may cause slight variation in color between the image and the actual item. Measurement tolerance: ±1–3 cm.