FiiO E3 Headphone Amplifier + Y Adapter Combo

The E3 is a headphone amplifier designed to improve the sound quality and volume of any audio device such as an MP3 or MP4 player, mobile phone, or computer. Specifications: Output Power 70 mW (32 ohms Loaded), 12 mW (300 ohms Loaded); Signal to Noise Ratio >= 90 dB (A Weight); Distortion < 0.05 % (10 mW); Frequency Response 10 Hz - 40 kHz; Suitable Headphone Impedance from 16 ohms to 300 ohms; Weight 11 grams (without battery); Power supply 1 AAA Battery; Dimensions 55 mm x 23 mm x 14.5 mm