SMART-41H Wrist 4-zone pager. Wrist 4 zone pager. It works with all interVision Smart buttons. It is durable thanks to a rubberized bracelet and plastic case. It can receive signals from 20 buttons at the same time: 5 buttons can be registered for each zone. There is a mode in which all zones light up at the same time. A charger and instructions are included with the pager for setting. The display has a reset button. Low power consumption. Removable battery.