Chengdu Vantron Technology Ltd. VTM2MBTA-DE 用户手册
VT-M2M-BTA-DE
3.3 Interface Instructions
3.3.1 Front View
3G / GPRS Antenna(3G Band) Antenna Gain:1dBi
WLAN / ZigBee Antenna(2.4G Band) Antenna Gain:3.2dBi
GPS Antenna(1.5G Band)