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Product Parameter: Power supply: DC 12-26V Output power: Max 120*2W SNR: 100db Channel amount: Dual channel stereo Efficiency: up to 90% Size: 90mm*68mm*16mm (length * width * height) Precautions (the following problem may happen to you): 1. With electromagnetic interference in working environment 2. There is a self-problem of the audio input device 3. Electromagnetic interference on the power supply Suggested treatment: Keep the amplifier a certain distance away from the power supply to avoid electromagnetic interference; Each amplifier chip has a unique sound field itself, if sound card driver or player software's sound effect have been set, some special effects software's simulation effect may cause amplifier distortion. It is recommended to close the sound setting of the software or driver before connecting your mobile phone or laptop computer; What is more, it is better to clean the volume potentionmeter after a long time usage. Note: -Please check the wiring diagram carefully before you use this amplifier board; -Do not use the speakers with too low power unceremoniously; -Unreasonable usage of power, voltage and power will damage the speakers and the AMP board. Package include: 1* 120x2W Audio Amplifier Board