[ 1 Year Warranty ] The unique shape design highlights the taste of the house owner. The costar doorbell is more durable by adopting high quality fuse [ Ultra Long Operating Range ] Costar M508 wireless doorbell operating range is 300m / 1000ft in open areas. You can install it in any corner in your space [ 32 Ringtones Available& 5 Volume Mode & Amazing LED ] Find your favorite Ringtones among 32 Chimes. 5 levels of volume for your space. Flashing LED-Light makes it easier for you to notice the coming visitors [ Suitable for Variable Environment ] The working temperature is from -20° to 60° （-4°F to 140°F）. Multiple Ringtones and LED light make it sutable for home office store school hospital and other spaces [ Easy to Install ] We had paired each door bell and receiver before they were sold. Just install and use them easily