OverviewThis headphone amplifier is made of aluminum alloy casing, which is convenient to handle and has good heat dissipation performance. The appearance is compact and easy to carry, with a 3.5mm input and output interface, suitable for connecting all kinds of smartphone computer equipment.FeaturesUses aluminum alloy shell, feels comfortable, good heat dissipation.The appearance is small and atmospheric, easy to carry.There is an independent gain control switch. The operational amplifier is suitable for both positive and negative power supplies.With 3.5mm input and output interface, suitable for connecting various types of smartphone computer equipment.Builtin 600mAh rechargeable lithium battery, low power consumption, working time is about 8 hours.SpecificationsInputOutput Port 3.5mm Studio InputLithium battery capacity 600mAhAmplifier usage time 8 hoursWorking voltage DC3.74.2VCharging voltage DC5VSNR more than 116dbDistortion 0.001Output power 32 Ohms 130mWLoad impedance 16300 OhmFrequency range 20Hz20kHz 3dbItem size 106.21.5cm 3.942.440.59inPackage Size 1384cm 5.123.151.57inPackage Weight 132g 4.66ozPackage list1 Headphone Amplifier1 USB power cable1 User ManualNotesThere is a battery inside the machine, please do not open it privately.Please do not use the machine in an environment with high temperature and humidity.