New Brookstone Mobile Sport Massager Silver Cordless Powerful Percussion Massage 1 on the knob and 2 flat spots on the knob. Dont miss out on a expert craftsmanship Dont miss out on a great Leather Imported Rubber sole Heel measures approximately 4 carry on case or backpack Dual grip design gives you complete control in massaging hard to reach spots Long travel massage node kneads deeply to unlock tension Variable speed lets you control massage intensity 12V lithium ion power cell won’t fade during use 3 Hours of use per charge Recharging port and LED charging lights hips—anywhere Helps alleviate muscle pain and accelerate muscle recovery Cordless and compact—fits in gym bag