SadoTech Wireless Doorbell – 1 Push-Button Ringer & 2 Chime Receivers, 1000 Feet Range, Battery Operated, LED Flash, Black

– Easily add loud (or silent) alerts anywhere in seconds
– Each doorbell kit receiver covers 600 ft (183 m) with durable construction
– Expandable system – add more doorbell push buttons and receivers
– Multiple doorbell tones to indicate which door has a visitor
– Perfect for teachers to command noisy classrooms and capture students’ attention
– Multiple tones, 4 volume levels, and a silent option for nurseries and quiet areas
– Add-on transmitter and receiver included