Fangrui Product Details Bluetooth Connection Range Of 15 Meters (no Obstacles In Between) Bluetooth Version: 5.0 Input Mode: Aux + Bluetooth Number Of Channels: 2.0 Channel (left Channel + Right Channel) Power Amplifier Chip: Tda7498e Adaptable Power Supply: Dc12 ~ 32v (below 9v Undervoltage Protection, Can Also Support 12v Power Supply) Adaptable Speakers: 30-200w, 4-8 Output Power: Left And Right Channel 150w Protection Mechanism: Undervoltage, Overheating, Overcurrent, Short-circuit Protection Batch Differences May Lead To Product Appearance, Printed Text, Color Be Different, Does Not Affect The Use Of Color: Black Material: Pcb+metal Package Contents: 1 X Amplifier Board (need To Install Themselves) 1 X Screwdriver Only The Above Package Content, Other Products Are Not Included. Note: Light Reflection And Different Displays May Cause The Color Of The Item In The Picture A Little Different From The Real Thing. The Measurement Allowed Error Is +/- 1-3cm.