Model Number: ZJ-49 Brand Name: CallingSYS Key Specifications/Special Features: Receiver server use RF wireless and learning code technology, can pair up to 999 wireless calling transmitter and 1 management remote controller and the receiver host adopts advanced micro processor and high-sensitivity super heterodyne receiving technology which make the products very stable, also it has adjustable voice prompt, different calling records display, and LED digital display functionsWireless calling system has millions of different code which can be paired easily and freely and widely used in restaurant, café, bar, tea shop, KTV, bank, office, factory, hotel and hospitalThis receiver host can read number 1 to 999 and also can distinguish the room number and desk number (bed number in hospital) model is common version, without computer functionTechnical data Working frequency 433.92MHz Working voltage 12V DC/2A power supply Standby current 200mA Working current <650mA Decoding mode Learning code Modulation AM Receiving sensitivity -110dBm Working temperature -10 to +50C Product size 410*158*45mm