Feature:1. GOOD PERFORMANCE: A HiFi headphone amplifier chip with low distortion, voltage and power consumption, for single battery power supply.2. OUTPUT INTERFACE: Designed with 3.5mm headphone hole output and 2.54mm pin output, which can be selected according to different needs.3. SMD PROCESSING: The mini headphone power amplifier board is made by SMD technology, ensuring dependable performance and good contact.4. 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.5. COMPACT SIZE: The headphone preamplifier module has compact size, and is easy to install, which is used for more audio devices.Specification:Item Type: Headphone Amplifier BoardModel: MAX4410Material: ABSWorking Voltage: DC 3-12VMaximum Output Power: 80mw x 80mw.Package List:1 x Amplifier Board1 x Nut1 x Iron WasherNote:Please be careful when using.