This wireless pet doorbell is suitable for dogs of all sizes and can function as a doorbell or pager for the elderly/sick. It has a long range of up to 300 meters, is waterproof with an IP55 rating, and is easy to use with just 80 lbs of pressure. The bell volume and ring tone can be customized with 5 different volumes and multiple tones. Comes with 1 transmitter and 1 or 2 receivers depending on the package. Features 1. Wireless Doorbell: It's a dog doorbells suitable for all size dogs-small, medium or large It's also can be used as a wireless doorbell for home or as caregiver page for an elderly or sick patient. 2. Long Range: Receiver and transmitter in the barrier-free environment, the maximum effective working distance can reach 300 meters, it's great for large house. 3. Waterproof: The waterproof grade is IP55, built-in waterproof rubber ring can work normally on rainy days, and can be used indoors and outdoors. 4. Easy-to-Use: Bell rings using just 80 lbs of pressure, making it easy to use for dogs of any size. 5. Customizable: Bell volume and ring tone can be customized to the style of your choice, with 5 different volumes and different tones to choose from. Specification Material: ABS Color: White, Black Size: Receiver: 8 x 8 x 5 cm, Transmitter: 6 x 6 x 2 cm Weight: 150 g, 275 g Battery: 12 V/23 A Battery Plug Type: US Plug Receiver Voltage: 110-260 V Pressure Required: 80 lbs Waterproof: IP55 volume: 5-level Working Temperature: - 30 ~ + 70 Package Include: 1 Transmitter 1 Receiver or 1 Transmitter 2 Receivers