【Super Wireless Range】 300-500m / 500-1000ft operating range in open area. The strong signal easily penetrates walls and doors. Never miss a visitor again, even if you are in the garden. 【Style Your Life】 45 ringtones available, 4 volume levels from 0dB to 110dB. If you want to be alone, just set the volume to 0dB and then you can enjoy a quiet day. In addition, there is a super flash on the push button and receivers, especially useful for the elderly and hearing impaired. 【Waterproof and Dustproof】 The IP44 "waterproof" rating ensures that it works well even in wet conditions, and the glossy surface is easy to clean. So you can rest assured to use it abroad. 【Easy and Quick Installation】 Simply plug the receiver into an outlet, connect the transmitter to the door frame, and off you go. Even an 8-year-old child can do this. 【Wide Applications】 Ideal for home, office, hotel, dormitory, factory, etc. In addition, it can also serve as a nursing alarm device for the elderly and sick.