... System Transmitter / Multi-function Calling Transmitter HJ/ Hotel service system / Table calling system: 1. Transmitter HJ can match receiver 801, 802. 2 ... , amusement parks, clubs, families, etc. 3. The distance between transmitter HJ and the receiver can be up to 500m in the ... .1 sickbed B:NO.2 sickbed C:NO.3 sickbed D:NO.4 sickbed.Stick the corresponding sticker on the LED ...