Product Material: plasticColour: blackWaterproof grade: IP55Working temperature: -30C to +70CWorking distance: 300 m (without barrier)Operating frequency: 43392Volume: 0-110 dB (5 levels adjustable, with mute control)Transmitter battery: 12 V 23 A 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 The dog bells just need to be easily pushed or pushed over the touchpad to activate the wireless doorbell by nose or clawThe distance between two bells is approx 20 secondsNo need to press Any small or large dog can do it 2EASY INSTALLATION All dog doorbells for potty training are wireless Stick the transmitter to the door/floor/wall with 3M double-sided adhesive tape, even on a board, and then place it in any place you needSimply connect the receiver to a power outlet The appropriate method is simple and easy to use3Adjustable sound and volume The intelligent dog doorbell offers 55 ringtones and 5 volume levels from 0dB to 110dB to choose from Set it to 0 dB (mute) when you need it4300 m wireless range The pet doorbell comes with transmitters and receiver Transmitter and receiver can be easily paired Stable signal transmission and good interference performance5IP55 waterproof The built-in waterproof sealing ring can protect the elements inside from water and dust to prolong the lifespan It can work normally on rainy days