Thank you for viewing. I am selling this item because I have multiple units at home and am not using this one. Although it's from a few years ago, it is unused, so I believe the condition is good. (I took it out of the box once to check the operation.) I think this is a very easy-to-use tool for assisting with stretching. Please consider it. 【Specifications】 Power supply: Rechargeable Charging time: Approximately 3.5 hours (for a full charge) Number of charging cycles: Approximately 350 times Battery life: Approximately 180 minutes Vibration frequency: Approximately 4000 times / minute Rated usage time: Approximately 10 minutes Operating environment temperature: 10℃ 〜 35℃, 30%RH ～ 85%RH Weight capacity: Approximately 100kg Body dimensions: W266 × D232 × H113 mm Weight: Approximately 660g (body only) Materials: Polyurethane, PU foam, ABS Accessories: AC adapter, USB cord