... panel, located at the staff area, including built in audio sound (chime) with optional external speaker. ... Power: ≤20mWTransmitted Distance>1000m in open area Warranty:12 MonthsFAQApplicationsWireless calling system can be used in restaurants, hotels, hospitals, tea ... pool, beach, etcWhat are the components of the wireless calling system?1. Wireless receiver, installed on the count 2. Call button ...