With One Master Base Unit and Several Portable Mini-pagers, the calling range is about 100 meters in open areaEasy Operation: press the call button on the transmitter to send a wireless signal to all caregiver pagers; the receiver can flash, beep and vibrate; press any button on the receiver to stop the alertonce activated the caregiver pager keeps ringing until deactivated by user; great for seniors or customers who need continued assistance when shopping or walking
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