【Long Range】Sufficient wireless range (280m/1000ft in open area) is perfect for your home, the signal can penetrate obstacles very well. Whether you are cooking in the kitchen or weeding in the garden, this wireless doorbell will notify you in time. Never miss a visitor! 【Waterproof and Weatherproof】 Thanks to IP44 waterproof technology and the operating temperature between -30°C and 70°C, the radio doorbell is also suitable for outdoor use. Such as rain, snow or sub-zero temperatures, it works perfectly. 【Easy Installation】Simply plug the receiver into a power outlet and install the push button on the wall or door frame with the provided screw or tape. The blue LED flashes when someone visits. 【Different Tones and Volume】 Choose from 36 different ringtones, from classic to well-known melodies. The adjustable volume from 25 dB to 85 dB is adjustable in 4 levels. 【Front Door Bell Radio】 1 receiver and 1 transmitter, no batteries required and no annoying cables. This wireless doorbell can be expanded with additional receivers and transmitters (same Charlemain model). Charlemain Wireless Doorbell, Wireless Doorbell for Indoor and Outdoor Use The wireless doorbell has a working range of 300m/1000ft, ensuring you'll never miss a visit or delivery. 300m Long Wireless Range The range between the transmitter and receiver is up to 300 meters! Sufficient radio range allows the radio doorbell to be installed anywhere in your home. The Charlemain radio doorbell can be expanded with additional transmitters and receivers (same model). Weatherproof IP44 waterproof and dustproof, suitable for indoor and outdoor use. The wireless doorbell can be used in the range of -20℃-65℃. You don't have to worry about sun, rain, snow or other extreme weather conditions such as frost. The wireless front doorbell has 4 adjustable volume levels (25db-85db) to meet your different needs. LED Signal The wireless radio doorbell is loud enough and there is a LED signal when ringing, which is convenient for the hearing impaired.1x Transmitter 1x Receiver 2x Screws 1x 12V A23 Alkaline Battery for Transmitter 1x Double-sided Tape 1x Small Screwdriver 1x User Manual Waterproof Radio Doorbell with a 3-year battery life, suitable for indoor and outdoor use Wireless Doorbell Dimensions Transmitter: 7.8 cm x 4.6 cm x 2 cm Receiver: 8.0 cm x 7.5 cm x 2.3 cm Specifications Ringtones: 36 Waterproof (transmitter): IP44 Operating temperature: -22 °C ~ 65 °C Volume: Adjustable in 4 levels (25db ~ 85db) Input voltage: AC110-240V 50/60HZ