Description: Featured with protection mechanism including over-heating, over-current and short-circuit protection, this amplifier board is safe to use. Using 2.0 stereo sound channel, this amplifier board can bring you excellent sound quality. It is constructed of PCB board material. The length of this amplifier board is 8.9cm, width is 6cm and thickness is 2.1cm. This amplifier board is suitable for family theater, phone, tablet, laptop, speaker, TV set and so on. Item Name: Amplifier Board Material: PCB Board Model: ZK-502MT Bluetooth-compatible Version: 5.0 Signal-to-noise Ratio: >90dB Input Method: AUX+Bluetooth-compatible Number of Channels: Left and Right Dual Channel (Stereo) Adapter Speaker: 15-100w, 4-8ohm Adapter Power Supply: DC 9-14V/3A (24V Battery Pack Cannot be Connected) Power Supply Voltage: 12V-8Ω/12W+12W, 4Ω/20W+20W 15V-8Ω/18W+18W, 4Ω/30W+30W 19V-8Ω/30W+30W, 4Ω/40W+40W 24V-8Ω/40W+40W, 4Ω/50W+50W Features: High Power, Plug Play, Single Channel Size Details: 8.9cm x 6cm x 2.1cm/3.5" x 2.36" x 0.83" (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 Screwfriver 1 x Power Adapter Featured with protection mechanism including over-heating, over-current and short-circuit protection, this amplifier board is safe to use. Using 2.0 stereo sound channel, this amplifier board can bring you excellent sound quality. It is constructed of PCB board material. The length of this amplifier board is 8.9cm, width is 6cm and thickness is 2.1cm. This amplifier board is suitable for family theater, phone, tablet, laptop, speaker, TV set and so on.