aeveone wired powerful handheld electric back massager, strong personal magic vibrations massage for sports recovery, muscle aches, body pain (white-us) aeveone function: material: environmental protection type abs silica gel product specification: 12.5inch *2.3inch ac power supply voltage: 110-250volts power frequency: 50-60hz vibrations frequency: 9000/min 8000/min- use time: 1.5h-2h 10 powerful speeds what is in the box 1- electric massager 1- travel bag product features: full body massage, promote blood circulation, relieve muscle pressure, eliminate fatigue