Fangrui Product Details Product Name: 2.1 Channel Bluetooth Audio Amplifier Module Product Model: -ht21 3g Bluetooth Version: 5.0 (unobstructed, 15 Meters) Input Method: Aux + Bluetooth + Usb (wheel Button To Switch Modes And Songs) Number Of Channels: 2.1 Channels (left Channel + Right Channel + Subwoofer) Power Amplifier Chip: Tda7498e Adaptable Power Supply: Dc 15~36v (less Than 9v Undervoltage Protection, Also Supports 12v Power Supply) Adaptable Speaker: 30-200w, 4-8 Output Power: Left And Right Channels Less Than 160w Subwoofer Less Than 220w Protection Mechanism: Anti-reverse Connection, Under-voltage, Overheating, Over-current, Short-circuit Protection Product Weight: One-piece Net Weight 344g, Including Packaging 393g Net Weight Of Lead-out Potentiometer 270g, Including Packaging 337g Tip: Only When The Audio Signal Input Is Large Enough And The Power Supply Voltage/current Is Large Enough, There Be Sufficient Output Power! The Higher The Power Supply Voltage, The Greater The Output Power, And The Smaller The Speaker