3-Year Battery LifeThe push button transmitter uses a CR2032 lithium battery which has an ultra-long lifespan of up to 3 years. No need to worry about frequent battery replacement. We offer lifetime technical support for this doorbell. | Durable Waterproof ButtonThe push button has a high waterproof rating of IP55, which is higher than ordinary doorbells, to ensure the perfect usage in rainy days. Works between -4°F to 140°F, to ensure that it is suitable for different areas of different climates. | Ultra-long Transmission DistanceThe wireless transmission range between the doorbell chime receiver and the doorbell push button is up to 1000 feet. With the ultra-long wireless range, this cordless doorbell can be used not only in apartments but also in villas and big houses. It can also be applied in business, office, store, classroom, etc. |