The VULKEN Acusphere Vibrating Massage Ball is the next generation massage ball one of VULKENs top rated vibrating foam roller series. It is a super-versatile piece of equipment that provides optimal solution for self-myofascial release (SME). It can be used at the gym at home at the working place or any trip to relax and loosen up muscles to improve circulation and flexibility and to reduce pain. VULKENs Acusphere helps you to: Release knots and tension Stop DOMS in its tracks Improve circulation Flush away lactic acid It is the best gym accessory to take along and a great addition to traditional foam rollers for many benefits: Warm up faster Keep muscles loose and flexible Increase resilience Get rapid training recovery End Next-Day Soreness Reduce muscular pain Heal injuries quicker Treat Plantar Fasciitis Perform at your best SPECIFICATIONS Model: Acusphere Measurement: 3.75inch in Diameter Net weight: 0.66 lb AC adapter: Input 110V240V 5060Hz. Output 9V 1A. Lithium-ion Battery (Built-in): 7.4V 1200mAh Auto Timer: 10 Minutes If you need to order a replacement charger you can find it here: https:www.Vulken-Adapter-Vibrating-Roller-100V-240VdpB09NXP3ZXQ