Descriptions:Vibration enhances the effectiveness a foam roller has on your muscles. The powerful motor delivers high-penetration relief and helps roll out tightness better than basic foam rolling.for Ideal for warming up, circulation improvement especially after weightlifting, yoga, cycling, running, cardio, or any other exercise. The foam roller can help relieve muscle pain in your lower and upper back, knees, leg, hamstrings, and more.Easier to carry and use. Shorter and for smart, ultra portable. Enjoy your personal massage therapist anytime, anywhere. It could be your best partner when you work out.The simple grooved design provides an even deeper roll. Specification:Color: BlackProduct name: Foam Roller MassageModel: 893999 Main material: EPP Expanded polypropylene)Package size:15x15x36cmSize: 31x15x15cmPower supply: Rechargeable type, battery capacity 7.4V, 2200mAhPlug: EU / US PlugVoltage: 110-240VCharging time: about 3.5 hoursCharge an discharge possible return: about 360 timesBattery duration: 180min(longest)/50min(shortest)Fixed use time:about 10minVibration return:-1:2300 back/min-2:2700 back/min-3:3100 back/min-4:3700 back/minUse ambient temperature: 10~40 Note:1. Please allow 1-2cm error due to manual measurement. Please make sure you do not mind before you bid.2. The colors may be different as the difference display. Please understandPacking List:1x Foam Roller Massage 1x Charger 1x User ManualThe passing years steal from us one thing after another.