Description: It is safe to use this amplifier board because it has protection mechanism including electrostatic protection, short circuit protection, overheating protection. Using BT 5.0 technology and dual stereo sound channel, this amplifier board can bring you HiFi and HD-compatible sound quality. It is constructed of PCB material. The length of this product is 5.2cm, width is 5.2cm and thickness is 2.2cm. This amplifier board is suitable for development and debugging. Item Name: Amplifier Board Material: PCB BT Version: 5.0 Transmission Distance: 15m (Unblocked) Power Supply: DC12-24V Number of Channels: Left and Right Dual Channels (Stereo) speaker: 30w-200W 4ohm, 8ohm, 16ohm Protection Mechanism: Power Reverse Connection Protection, Short Circuit Protection, Overheating Protection Support APP: for YS Audio-APP Control Features: High Power, Plug Play, Stereo Channel Size Details: 5.2cm x 5.2cm x 2.2cm/2.05" x 2.05" x 0.87" (Approx.) Notes: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: 1 x Amplifier Board 1 x Screwdriver It is safe to use this amplifier board because it has protection mechanism including electrostatic protection, short circuit protection, overheating protection. Using BT 5.0 technology and dual stereo sound channel, this amplifier board can bring you HiFi and HD-compatible sound quality. It is constructed of PCB material. The length of this product is 5.2cm, width is 5.2cm and thickness is 2.2cm. This amplifier board is suitable for development and debugging.