Features: Bluetooth-compatible 5.0, supports changing the name and password of the serial port, supports button shutdown/power on, supports changing the volume and closing of the serial port prompt sound, supports call shutdown, power on, and default biggest volume. At 24V6A, the output power is up to 100W. At 21V5A, the output power is up to 80W. 8-26V power supply, with reverse connection protections, supports laptop power adapter power supply. Quality circuit boards and electronic components, with excellent workmanship and reliable quality. Specifications: Material: Printed Circuit Board Size: Approx. 7.8x5.2cm/3.07x2.04inch Fixed Hole Distance: Approx. 7.3x4.7cm/2.87x1.85inch Package Includes: 1x Bluetooth-compatible 5.0 Amplifier Board note: Please allow 1-2cm errors due to manual measurement. Please allow for slight color differences due to different display resolution.