Easy access battery compartmentUP to three transmitters can be paired to one receiverLow Battery IndicationBattery removal ribbonMultifunctional button/scroll wheel accessing the intuitive programming systemThree alerting options: Sound only, Flash only or Sound and Flash togetherFlashing Doorbell: Ultra-bright flashing lightIndicator symbolsDoorbell with chimes: 8 x Extra loud doorbell/telephone chime sounds of up to 100dB!Batteries Included!Up to 300m range in open spaceOptional Telephone Transmitter, Audio Transmitter and Mains Power supply availableIP56 Weather rating. Receiver Features https://youtu.be/Hz2BxeERZk8