Product Description
Functions :
1) Password: 1 - 6 digits
2) Capacity: can be mated with 331 units
3) Alarm delay time: 1 1,000 seconds
4) Monitor time: 1 1,000 seconds
5) Display: 4 digital
6) Alarm number: 3 - 4 digital
7) Conversation time limit: 75 seconds
8) Voltage: DC 12V
9) Temperature: -10 - 55oC