Digital Amplifier Board High-Power Safe DIY Audio Amplifier Module for SpeakerSpecifications: This amplifier board is safe to use because it features protection mechanism including over-heating, over-current and short-circuit protection.This amplifier board uses 2.0 stereo sound channel, and you will have 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 BoardModel: ZK-502MTBluetooth-compatible Version: 5.0Signal-to-noise Ratio: >90dBInput Method: AUX+Bluetooth-compatibleNumber of Channels: Left and Right Dual Channel (Stereo)Adapter Speaker: 15-100w, 4-8ohmAdapter Power Supply: DC 9-14V/3A (24V Battery Pack Cannot be Connected)Power Supply Voltage: 12V-8Ω/12W+12W, 4Ω/20W+20W15V-8Ω/18W+18W, 4Ω/30W+30W19V-8Ω/30W+30W, 4Ω/40W+40W24V-8Ω/40W+40W, 4Ω/50W+50WFeatures: High Power, Plug Play, Single ChannelSize 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