Key features

• •【Topping NX3s Portable Headphone Amplifier】: OPA2140 + LME49720. LME49720 has an operational amplifier socket and can be changed to other DIP-8 dual op amp.
• •【Exceeding Hi- Res Audio standard】NX3s has been certified by Hi- Res Audio authentication Japan, 20-200kHZ frequency response.
• •【Bass & Gain Adjustment】It can satisfy different listening preferences and make up for the lack of earphone bass.0dB / 8.8dB gain regulation.
• •【Drive most headphones】NX3s also can drive high impedance earphone. 545mW * 2 output; It can still output 100mW power at 300Ω impedance.
• •【18H work & 4H fast charging】NX3s built in 2400mah Lithium ion battery. NX3s can adaptively charge current of 0.5A or 1A. If 1A current charger is used, it can be filled for 4 hours