Portable Wireless Calling System

Following are the Main Features of Portable Wireless Calling System i
a Radio Frequency Identification Technology, Simple installation
a Code preprogrammed, simple operation
a c Capacity up to 99 call bells
a L Use high-brightness digital tube and LCD display screen to show numbers clearly
a Vibration prompts, intensity adjustable.
a Y 1st to 9TH number can be check by turn on or off.
a Use super heterodyne receiver with >-108dBm sensitivity for stable far distance signal.
a Alarm Function, monitoring interference signal.

The detail specification:
Main Unit
Item No.: GDM200S
Voltagei DC3.6-4.2V
Shutdown Current i <300Ua
Standby Current i <6mA
Frequency i 315/433.92M
Sensitivity i >-108dBm
Size i 59*35*16mm

Model No.i GDT-01S
Frequency i 433MHz
Voltage i 4.5V Battery
Chip model i CS5880
Transmission Distance i 500mi free areai
Current i 100mA,A 5mA
Button Size i a R68*25mm
Button Stand Size i 105A 100A 6mm
Bill Stand Size i 195A 100A 4mm