Specification: *Model NO.: YM-212 * Driver Units: 2 X1.5"anti-magnetic, 8ohm, 2W speakers * Amplifier Impedance: 8 ohms * SNR: >38dB * Input: 3.5mm Stereo headphone Jack, Direct Input * Output Power: 2W*2 * Frequency Response: 120HZ-20KHZ *Power supply: Built-in rechargeable Li-Ion battery Features: *Modern fashion design , simple and beautiful appearance; *Shuffle Docking; *Built-in Digital Amplifier; *Stereo headphone jack, 3.5mm; *With high-power and optimized bipolar makes you enjoy the HI-FI music; *Full anti-magnetic and innovative design; *Recharge circuit with overcharge protection built in; *DC Built-in rechargeable Li-Ion battery; *USB to 3.5mm stereo cord; *Lower power-consumption, with up to 6 hours of audio on a single charge. *Exterior with lead-free metal paint