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