CozyPods W7N Pro is the product model. Version 5.4 for wireless Distance of transmission: ≥10 M Sound frequency: 20 Hz to 20 kHz Impedance: 320 Power rating: 3 mW The charging compartment's battery capacity is 300mAh. 40mAh is the headphone battery's capacity. There are two to three rechargeable times in the charging compartment. Input: 5V = - = 300mA Playing for five to seven hours 90-day standby period About 1.5 hours are needed for charging. The product weighs 35 grams net. The charging compartment measures 59 by 46 by 26 millimeters.