Product DescriptionMaterial: plasticColor: blackWaterproof rating: IP55Operating temperature: -30 °C to +70 °COperating distance: 300 m (without obstacles)Operating frequency: 43392Volume: 0-110 dB (5 adjustable levels, with mute control)Transmitter battery: 12V 23A alkaline zinc-manganese battery (built-in)Receiver (length x width x thickness): 6*6*15cmTransmitter (diameter x thickness): 78*5cmPackage 1 includes: 1*receiver, 1*transmitterPackage 2 includes: 2*receiver, 1*transmitter1Easy to trigger To activate the dog bells for the wireless doorbell, simply press or gently push the touch pad with your nose or paw. The distance between the two bells is about 20 seconds. No pressing is required. Any small or large dog can do it. 2EASY INSTALLATION All dog bells for potty training are wireless. Attach the transmitter to the door/floor/wall with 3M double-sided tape, for example on a whiteboard, and then place it wherever you need it. Plug the receiver into a power outlet. The correct method is simple and easy to use3Adjustable sound and volume The smart dog doorbell offers 55 ringtones and 5 volume levels between 0-110 dB. Set it to 0 dB (mute) if needed.4300 m wireless range The pet doorbell has transmitters and a receiver. The transmitter and receiver can be easily paired. Stable signal transmission and good anti-interference capability5IP55 waterproof Built-in waterproof sealing ring protects internal components from water and dust, extending service life. It works normally on rainy days