USB digital audio input 

Support for Apple devices: iPhone5S/5C/5, iPhone4S / 4, iPhone 3G/3GS, 
iPad (4/3/2/1 generation), iPad mini, iPod touch 
D / A converter chip: WM8741 
Sampling frequency: 44.1/48kHz @ 16bit 
Analog audio input ≤ 1000mV 

Headphone output 
Maximum output power: 130mW +130 mW (32Ω load)  
Frequency response: 20Hz-20kHz (± 1dB) (AUDIO IN analog input)  
Total harmonic distortion: ≤ 0.05% (1kHz)  
SNR: ≥ 98dB (A-weighted)  
Lithium battery capacity: 2500mAh 
Charging time: ≤ 4 hours (need power off)  
Life time: ≥ 8 hours (32Ω load)  
Charge limit voltage: 4.2V 
Net Weight: 180g 
Size: 60mm x 20mm x 130mm (W x H x L) 

Specification 
Wolfson WM8741 DAC chip 
Supports up to 16bit, 44.1/48 kHz sampling 
Compatible with iPhone 6S/6/5S/5C/5/4S/4/3G/3GS, iPad 4/3/2/1, iPad Mini, iPod Touch 
Inputs: USB and 1/8 in (3.5 mm) jack 
Output: 1/8 in (3.5 mm) jack 
Front volume dial 
Analog audio input: < 1000 mV 
Maximum output power: 130 mW + 130 mW (32 Ohm load) 
Frequency response: 20 Hz - 20 kHz +/- 1 dB 
Total harmonic distortion: < 0.05% (1 kHz)/li> 
SNR: > 98 dB (A-weighted) 
Lithium battery capacity: 2500 mAh 
Charging time: < 4 hours 
Life time: > 8 hours (32 Ohm load) 
Charge limit voltage: 4.2 V 
2.36 x 0.79 x 5.12 in (60 x 20 x 130 mm) 
6.35 oz (180 g)