CORDLESS & RECHARGEABLE: Includes a high-quality rechargeable lithium battery, takes 4 hours to be fully charged, red light to show uncharged, 4 LED lights with green/red to show battery status, using time 180 min. Perfect for use at home, work, or the gy4 REPLACEMENT MASSAGE HEADS: 4 attachment heads to easily reach and stimulate trigger points. Ball Head for massaging large areas and large muscle groups. Small Round head for massaging small areas of muscle and muscle groups. Bullet Head for massaging de