Multi-Tech Systems MTCBA-G-F2 - Manual (Page 20)

Specifications
20
Electrical Characteristics
Switching the GSM
modem on/off The device is permanently powered
(when connected to the power supply).
Voltage Range Voltage range : 5 to 32V DC
GND : 0V
Overvoltage and
Undervoltage Correct operation of the Wireless
MultiModem in communication
mode is not guaranteed if input
voltage falls below 5V.