Product DescriptionMaterial: plasticColor: blackWaterproof rating: IP55Working temperature: -30C to +70CWorking distance: 300 m (without obstacles)Working frequency: 433.92Volume: 0-110 dB (5 levels adjustable, with silent control)Transmitter battery: 12 V 23 A alkaline zinc-manganese battery (built-in)Receiver (length x width x thickness): 6*6*1.5cmTransmitter (diameter x thickness): 7.8*5cmPackage 1 includes: 1*receiver, 1*transmitterPackage 2 includes: 2*receivers, 1*transmitter1 Easy to trigger The dog bells only need to be pressed lightly or slid over the touchpad to activate the wireless doorbell with nose or paw. The distance between two bells is about 20 seconds. No need to press. Any small or large dog can do it.2 EASY INSTALLATION All dog doorbells for potty training are wireless. Attach the transmitter to the door/floor/wall with 3M double-sided tape, even on a board, and then place it anywhere. Just plug the receiver into a power outlet. The convenient method is simple and easy to use.3 Adjustable sound and volume The intelligent dog doorbell offers 55 ringtones and 5 volume levels from 0dB to 110dB to choose from. Set it to 0dB (silent) when you need it.4 300m wireless range The pet doorbell comes with transmitter and receiver. Transmitter and receiver can be easily paired. Stable signal transmission and good anti-interference performance.5 IP55 waterproof The built-in waterproof sealing ring can protect the elements inside from water and dust to extend the service life. It can work normally on rainy days.