[1 transmitter with 2 receivers] - The wireless doorbell is equipped with two receivers, which can be safely applied to various scenarios such as apartments and houses. [Four level volume adjustment] -- Wireless doorbell battery powered, support four level volume adjustment: off - low - medium - high. Plug-in doorbell receiver volume up to 110db. [Flashing doorbell] - colored flashing lights make the wireless doorbell not only a doorbell with flash, but also an ornament. It also provides convenience for people with hearing impairments. Waterproof Doorbell - This doorbell and doorbell offer IP44 water and dust resistance. Doorbell buttons can be installed indoors and outdoors. Package content - Wireless doorbell transmitter X1, receiver X2, manual X1, Note: Packaging does not come with batteries