Features 1Functions: :This doorbell has a pleasant and distinctive sound is an ideal tool for use by people with hearing impairments. It can also be used as a call button for the elderly and pregnant women to call for help. 2Strong Penetration: This smart doorbell has a powerful penetrating power, with a long range unobstructed acceptance distance of up to 300 meters. 3Waterproof Design: The transmitter meets the IP44 waterproof standard, which can stop rainwater intrusion and effectively prolong the life of the product. 4Wide Application: Wireless doorbells are suitable for many placs, such as apartment houses, townhouses, small businesses, warehouses, offices and homes. 5Easy Install: This doorbell is easy and convenient to install with no tools or electrical expertise required, you can compplete in a few minutes. Specification Item Type: Smart Home Wireless Doorbell Material: ABS Doorbell Size: Approx: 95x65x24mm/3.74x2.55x0.94in Transmitter Size: Approx: 77x46x20mm/3.03x1.81x0.78in Package List 1 x Doorbell 1 x Transmitter Note 1. Please allow slight error due to manual measurement. Thanks for your understanding. 2. Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object. Please take the real one as standard.