Built in 1800mAh lithium battery, easy to charge, endurance. Deep tissue massager adopts ABS and metal material, firm and sturdy, stable and durable. -Multiple Applicable Scenarios: Muscle massager is suitable for daily massage relaxation, relieving muscle soreness after fitness, office relaxation, etc. -Cold Compress: Head helps treat muscle inflammation. Before using the cold compress head attachment, it works best after the cold compress head is placed in the refrigerator for about 2 hours. -Portable Design: Conform to ergonomic design, non slip handle, easy to hold and use, can be operated with one hand. Lightweight, easy to carry, perfect for home and travel. -Replaceable Massage Head: Removable design, just twist hard when removing the massage head. Multiple massage head are available, with different function and effect. -Cold Compress: Head helps treat muscle inflammation. Before using the cold compress head attachment, it works best after the cold compress head is placed in the refrigerator for about 2 hours. -Multiple Applicable Scenarios: Muscle massager is suitable for daily massage relaxation, relieving muscle soreness after fitness, office relaxation, etc. -Replaceable Massage Head: Removable design, just twist hard when removing the massage head. Multiple massage head are available, with different function and effect. -Portable Design: Conform to ergonomic design, non slip handle, easy to hold and use, can be operated with one hand. Lightweight, easy to carry, perfect for home and travel. -ABS And Metal Material: Built in 1800mAh lithium battery, easy to charge, endurance. Deep tissue massager adopts ABS and metal material, firm and sturdy, stable and durable.