Active buzzer module, high-level triggered buzzer control board, microcontroller expansion 3.3V-5V.

Legrand 041647 Salsa Doorbell with Label Holder IP44 IK06

Wireless Doorbell, Waterproof Wireless Chime with 300 Meter Range, Chime Kit with LED and 36 Melodies at 4 Volume Levels for Home, Office, Hotel-1 Transmitter and 2 Receivers Included

Wireless Doorbell, Waterproof Door Bell with 300 Meter Range, Wireless Chime with 1 Transmitter and 1 Plug-in Receiver and 36 Ringtones 4 Level Volumes for Home, Office, Shop

Legrand 041651 - Chime 110-230 V - 50/60 HZ - 2 tones - NF use certified

Legrand 041645 Push button legrand salsa - label holder - ip 30 - ik 06

Hager SU213 - Modular bell 230V

Wireless Doorbells, 45 Melodies 5-Volume Levels, IP55 Waterproof Wireless Chime, Chime Kit with 300 Meters, LED Flash, 2 Plug-in Receivers

Wireless and Battery-Free Doorbell Outdoor Waterproof IP 65 Snow Rain Humidity, White

Wireless Outdoor Doorbell - Waterproof with 2 Receivers - IP68 Waterproof - 150m Range - 4 Volume Levels - 36 Ringtones - No Battery, White

[No Batteries Required] Wireless Doorbell, Waterproof Doorbell, Electronic Chime Set with 2 Plug-in Receivers, 150m Range, 52 Melodies at 4 Volume Levels for Home, Office, Hotel

Wireless Doorbell, 400m Long Door Chime, IP55 Waterproof Electronic Chime Chime Kit with Plug-in Receivers for Home, 55 Melodies at 5 Volume Levels, Blue Black LED

IP44 Waterproof Outdoor Wireless Doorbell, 300 Meter Range Doorbell Kit with Flash LED, 2 Transmitters and 1 Receiver, 5 Volume Levels, 36 Melodies

Wireless Doorbell with No Battery Outdoor Waterproof IP 65 Snow Rain Humidity,white

Wireless Doorbell, No Batteries IP45 Waterproof Door Bell Electronic Chime Kit, 38 Chimes at 4 Volume Level

Waterproof, wireless doorbell with 2 receivers – 150 m range, 45 melodies and adjustable volume (0–90 dB) – Quick and easy installation

Tonchean – IP55 Waterproof Wireless Doorbell and Chime – Adjustable Volume 85 dB – 300 Meter Range – 45 Melodies – 2 Plug-in Receivers

4-inch stainless steel electric doorbell, internal spark-proof bell type, 220V 10W, for audible signals and alarms in large public places--