Purchased one year ago. I bought and used the Unit-01 version, and I'm selling the Unit-02 version since I didn't use it. Input: DC 5V 1.0A (USB rechargeable) Rechargeable battery (built-in): Nickel-hydrogen storage battery 3.6V, 2000mAh Charging time: Approximately 3.5 hours Continuous usage time: Low - Approximately 7 hours Weak - Approximately 4 hours Strong - Approximately 2.5 hours Size: Approximately w190 d40 h290 Weight: Approximately 225g Materials: ABS (body), Polypropylene (blades) Silicone rubber, Iron (arm) Accessories: USB charging cable, hair tie Storage instructions: For long-term storage exceeding six months, please fully charge the main unit before storing.