1.The multi-function model has three gears, heating function 2.One gear for ordinary models 3.Power supply mode: rechargeable 4.Massage techniques: massage, kneading 5.Applicable parts: neck 3.✅If there is a problem with product, please contact the customer service as soon as you receive the package. We will do our best to solve the problem for you. ❌A negative review will not help solve the problem! Thanks!