Features GOOD PERFORMANCE: A HiFi headphone amplifier chip with low distortion, voltage and power consumption, for single battery power supply. 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 mini headphone power amplifier board is made by SMD technology, ensuring stable performance and good contact. VOLTAGE AND POWER: The working voltage of the amplifier board is DC 3-12V, the maximum output power is 80mw x 80mw, stable and practical. COMPACT SIZE: The headphone preamplifier module has compact size, and is easy to install, which is used for more DIY audio devices. Specification: Item Type: Headphone Amplifier Board Model: MAX4410 Material: ABS Working Voltage: DC 3-12V Maximum Output Power: 80mw x 80mw Package List:1 x Amplifier Board 1 x Nut1 x Iron Washer Note:Please be careful when using. Package List 1 x Amplifier Board 1 x Nut 1 x Iron Washer