Features GOOD PERFORMANCE: A HiFi headphone amplifier chip with low distortion, voltage and power consumption, for single battery power. OUTPUT INTERFACE: Designed with 3.5mm headphone hole output and 2.54mm pin output, which can be selected according to different needs. SMD PROCESSING: The power amplifier board of the mini headset is made according to SMD technology, ensuring stable performance and good contact. VOLTAGE AND POWER: The working voltage of the amplifier board is 3-12V DC, the maximum output power is 80mw x 80mw, stable and convenient. Compact size: The headphone preamp module has a compact size and is easy to install, which is used for more DIY audio devices. Specification: Item Type: Headphone Amplifier Board Model: M AX4410 Material: ABS Working Voltage: DC 3-12V Maximum output power: 80mw x 80mw Package list: 1 x Amplifier Board 1 x nut. 1 x iron washer. Note: Please be careful when using. Package List 1 x Amplifier Board 1 x Nut 1 x Iron Washer