Come and see our amazing products! Our cervical massager is USB rechargeable, with a built-in polymer lithium battery. It has a long standby time and can be used for seven days if it is used twice a day. The strength of 15 gears can be adjusted, and 99 massage techniques can bring you a different experience. Matte spray-painted curved electrode sheet, suitable for different people's necks, comfortable, and not allergic. The default working time is 15 minutes each time. It will automatically shut down after massage, which saves worry, saves power, and delays service life. Quantity over 3000 is by sea. Pls confirm further with us if any query about packing info, inventory status and time schedule.