Used a few times, but I'm selling it now as I'm not using it. Kyoko Iwasaki supervised cordless electric stick-type vibration roller. Twist, stretch, roll, vibrate, and with a variety of movements, it approaches the stiff back. Easy self-care for the back, neck, shoulders, lower back, and legs, which are difficult to care for on your own. Recommended for relaxing time as you can use it while sitting. Cordless + USB rechargeable, so you can care for yourself anywhere in the house. A gourd-shaped rotating, fluffy roller that fits the body with added unevenness. You can comfortably care for yourself with vibrations that feel like you're being tapped with fingers, with less strain. [Body Size] When retracted/approx. W100 x D466 x H98 (mm), when extended/approx. W100 x D620 x H98 (mm) [Weight] Approx. 700g [Power Supply] Rechargeable (Built-in lithium-ion battery 1000mAh/3.7V) [Rated power consumption] Maximum 2.4W [Charging time] Approx. 140 minutes [Battery life] Approx. 110 minutes (using 1 mode for 5 minutes, 22 times) * [Grip rotation angle] Approx. 320 degrees [Vibration frequency] Mode L (weak) approx. 3,000 times/min Mode M (medium): approx. 4,000 times/min Mode H (strong): approx. 5,000 times/min Mode R (rhythm): approx. 3,000-5,000 times/min [Timer] 5 minutes for each mode (continuous usage time) Automatic power-off function [Load capacity] 100kg or less