rechargeable batteries:The cordless lower back pain massage is designed with a built-in battery. You can enjoy heating and massage anytime and anywhere to relieve pain. You can also use a power bank to extend the outdoor use time. 3 levels of vibration mode adjustment + 3 levels of hot compress temperature adjustment:The heating pad for back pain relief offers customization comfort with three heating levels ranging from 40C-60C and 3 levels adjustable vibration intensities. The combination of heat and vibration provides an effective solution for back pain relief, helping to alleviate sore or painful areas. Extra Lumbar Support: The heating pad for back includes non-removable support poles that provide extra lumbar support, helping to keep your spine . This feature is especially beneficial for relieving lower back pressure during long hours of housework or heavy physical labor. Designed for Pain Relief: This back brace for lower back delivers targeted heat therapy and soothing vibration massage to alleviate discomfort in the lower back, hips, waist, and abdomen. It's ideal for relieving menstrual cramps, abdominal pain, stomach upset, leg arthritis, and muscle tension. Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.