Fangrui Product Details 1. Tpa3221 Pure Power Amplifier Board, One-click Bridging 2. Mcu Intelligent Anti- Sound, 3. Bridge 200w 4. Dual Channel 100w+100w 5. Input Anti-reverse Connection 1. Product Name: 100w+100w Dual Channel/200w Mono Pure Power Amplifier Board 2. Power Amplifier Chip: Tpa3221 3. Product Model: -2001 4. Adaptable Power Supply: Working Voltage Range 10-30vdc, Limit 31v. It Is Recommended To Use A Dc Power Supply With A Voltage Of 24-30v And A Current Of More Than 10a. The Higher The Voltage, The Greater The Output Power. Connect To Alternating Current, Otherwise It Burn Out! 5. Adaptable Speakers: 3-8 In Btl Dual-channel Mode, 20-100w; 2-8 In Pbtl Mono Mode, 50-200w 6.heat Dissipation Method: Multi-tooth Heat Sink 7. Gain Selection: No. 2 Dial Switch 2-level Selection, 28db, 38db 8. Bridge Connection Method: Turn Off The Power First, Turn The Dial Switch To The On Position, Short-circuit R+ L+ At The Output Terminal For Parallel Output, And Short-circuit R-l- For Parallel Output. 9. Maximum Power: