Support output volume adjustment and adjustment Support one 3.5mm headphone port and one 3.5mm input port Support Bluetooth connection Type-c port for charging Aluminum alloy material, full of texture Input port:3.5mm(TRS) Headphone port:3.5mm(TRS) Charging port:Type-c Bluetooth-Compatible Version:BT 5.0 Built-in battery:3.7V/1400mA Charging voltage:5V/500mA Standby power:38mA Maximum working current:250mA Duration:≥6 hours 16Ωheaphone power:110 mW 32Ωheaphone power:105 mW 150Ωheaphone power:6 5mW 300Ωheaphone power:35 mW 600Ωheaphone power:20 mW Maximum output -p:9.9Vp-p +N:0.02% Signal to noise ratio:100db Frequency response:20hz~20Khz talk:100db Sound balance:0.3db Color: Black Material: Aluminum Alloy Package Contents: 1 * Power amplifier 1 * Audio cable 1 * USB cable Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.