Features: ● TPA6120A2 chip, the degree of distortion are less than 0.000635pct ● Support HiFi, please you by original sound ● Bass button, bass or not, your call ● Full metal shell, nice touch feelings and wonderful using experience, cool decoration ● High capacity battery: More than 25 hours, 30 minutes charging, 5 hours using time ● Portable design, can be put in into pocket ● Beautiful appearance, perfect gift Specifications: ● Impedance: 16 - 300ohms ● Maximum output power: 103mW ● Frequency response: 20 - 20KHz ● Digital noise floor: Less than 0.09mV ● Signal to noise ratio: 108dB ● Charging time: Less than 4 hours ● Play time: More than 25 hours ● Gain: 6dB Channels: 2 (2.0) Model Number: NX3 Special Feature: Mini,Portable Usage: Plug and play0.216Package weight: 0.251 kg Product Size(L x W x H): 11.00 x 7.00 x 1.50 cm / 4.33 x 2.76 x 0.59 inches Package Size(L x W x H): 17.50 x 13.50 x 3.00 cm / 6.89 x 5.31 x 1.18 inchesPackage Contents: 1 x Headphone Amplifier, 1 x Audio Cable, 1 x USB Charging Cable, 2 x Silicone Band, 1 x Multilingual User Manual