Hi~Welcome! Hope you have a nice day! Description: Earmuffs have 3 major effects: 1. Protect the ear. The head of the earmuff is made of soft plastic and has elasticity to protect the child's soft eardrum. 2. Protect the probe, the ear will be attached to the earmuff, not the probe, so when you wipe, less contact with the probe, prolong the life of the ear thermometer. 3. Safety, different people use different earmuffs to reduce cross-infection. Can be used 10 times under one earmuff. But the substitution suggests that changing the earmuffs and the toothbrush is a matter of personal hygiene. It is recommended to buy 1-2 more boxes because the earmuffs have no shelf life. This product is suitable for Braun ear thermometers. 20 sets of earmuffs, carton packaging: IRT1020/IRT2020/IRT2520/IRT3020/IRT3520/IRT4020/IRT4520/Pro4000/Pro6000/6500/6020/6520 and other [Blang brand] ear thermometer models are common. Package Included: 1 box * disposable ear thermometer set (20)