Feature 1GOOD PERFORMANCE: A HiFi headphone amplifier chip with low distortion, voltage and power consumption, for single battery power supply. 2OUTPUT INTERFACE: Designed with 3.5mm headphone hole output and 2.54mm pin output, which can be selected according to different needs. 3SMD PROCESSING: The mini headphone power amplifier board is made by SMD technology, ensuring stable performance and good contact. 4VOLTAGE AND POWER: The working voltage of the amplifier board is DC 3-12V, the maximum output power is 80mw x 80mw, stable and practical. 5COMPACT SIZE: The headphone preamplifier module has compact size, and is easy to install, which is used for more DIY audio devices.SpecificationItem Type: Headphone Amplifier BoardModel: MAX4410Material: ABSWorking Voltage: DC 3-12VMaximum Output Power: 80mw x 80mw .wang-edit-text{ font-family:'Arial' important; } .wang-edit-text table { border-top: 1px solid 000; border-left: 1px solid 000; } .wang-edit-text table td, .wang-edit-text table th { border-bottom: 1px solid 000; border-right: 1px solid 000; padding: 3px 5px; } .wang-edit-text table th { text-align: center; }Package List1 x Amplifier Board1 x Nut1 x Iron WasherNotePlease be careful when using.