BU737 No operational issues. Alcohol-sterilized. Supervised by Tokyu Sports Oasis Fitness Club Vibration Fitness Machine Shape Twin Ball STB-100 (5 vibration levels) ● Set includes: Main unit, AC adapter (for charging), Instruction manual ● Model number: STB-100 ● Size (approx.): Diameter 9 x Length 19 cm ● Weight (approx.): Main unit: 810g ● Color: Black ● Materials: Main unit: ABS resin, Silicone rubber ● Batteries used: Lithium battery x 1 ● Charging time (approx.): 3.5 hours ● Continuous operating time (approx.): Automatically stops after 15 minutes (Operating time: 2 hours (vibration level 5, room temperature 23°C))