4-key service button for restaurant service calling

Wireless nurse call systems Call button Y-SW-G33 with handset

Wireless Call Button Y-Cancel 

wireless call button

Y-O 1-key Call Button in red/black

Single Key Button of wireless calling system

Single Key Button of 433Mhz frequency wireless calling system

Waterproof Restaurant Wireless Call Button 

Waterproof wireless 433Mhz table bell for restaurant