... iPod, or iPad more conveniently.Built-in rechargeable battery, plug and play, no need extra power.Parameters:Input Voltage 3V ... Capacity 300mAhImpedance 4ΩFrequency 200Hz-17KHzSensitivity 89dB±3dbConnector 3.5mm jackCompatible with:all 3.5mm jack mobile phone, digital products, like iPhone ... iPod iPad.Package included:1 x Portable 3.5mm jack Mini Speaker 1 x USB cableAs a professional ...