120V only. * Thumper's Sport patented drive system technology transmits energy deep into the muscle tissue * Variable speed control from 20 to 40 pulses per second that match your muscles' natural healing frequency * A True Speed feedback system that prevents low speed stalls * Interchangeable massage spheres that let you customize your massage experience * Long ergonomic handle makes it easy to reach all muscle groups neck shoulders back legs * Easy to clean just wipe with damp cloth * Hand manufactured in Canada ensuring the highest quality product Specifications: Size: 16 L x 6 W x 5 H (40 cm x 15 cm x 13 cm) Weight: 3 lbs. (1.4 kg) FDA Class 1 approved Electrically approved UL CSA CE ROHS 2-year warranty (parts & labor