Crenova 36 Tunes Song LED Waterproof Wireless Remote Control Receiver Doorbell Home Security Door Bell Chime (Black-White, 2 Receivers) Waterproof design. One transmitter and two receivers. Gbargain Smart doorbell, you will never miss any guests Wireless designed for easy install and operates. With 1 remote control(transmitter) and 2 receivers. If you need 1 receivers,pls search Universal Product Code:852662434149