describe Material: Our doorbell cover is made of eco-friendly transparent material. You will clearly see the button indicator light to indicate if the product is working properly and the battery can be replaced in time. Room number column: Remind the postman not to ring the wrong doorbell and disturb the neighbors. Easily press buttons without rubbing your fingers. 5-sided protection: waterproof, 5-sided protection on top, left, back and right. Highlight the humanized local design. The waterproof cover is especially suitable for winter use; it minimizes the effects of snow, condensation and fog on the buttons. Maximum size: 11.1 x 6.35 x 5.2 cm. Weight: 42 grams. Works with most doorbells. The waterproof cover is especially suitable for winter. Features : 1. The waterproof cover is especially suitable for winter use. 2. The influence of snow, condensation and fog on the keys can be minimized. 3. Transparent material, so that the indicator light is clearly visible, indicating whether the product is working normally, and the battery should be replaced in time.