- Brand: Twinmask
- Model: MT-90
- Color: Yellow
- Quantity: 1
- GPS Chip: SiRF-Star III GPS
- Network: GSM / GPRS
- Frequency range: 1575.42MHz
- GSM/GPRS Module: SIM 900 (four-frequency 850 / 900 / 1800 / 1900 MHz)
- GPS Sensitivity: -159 dBm
- GPS Accuracy: 15 meter
- Warm start time: 35 seconds
- Cold start time: 37 seconds
- Hot start time: 1 second
- Antenna: Built-in
- Maps included: Google map
- Screen size: No
- Screen format: No
- PC interface supported: USB 2.0
- Operation temperature: -20 centigrade ~ 55 centigrade
- Humidity: 5% to 95% Non-condensing
- Altitude limit: 18000 Meters
- Velocity limit: 514 Meters / second
- Memory: 2GB
- Memory Card Type: TF
- Max Extended Capacity: 2GB
- Battery Type: Rechargeable 750mAh / 3.7V
- Battery Standby: 120 Hours
- GPS System Features: Small size, with buckle on the back, convenient to carry; Waterproof rate IP67; Support setting several instructions at a same time; Support setting a SMS center; Support setting 5 authorized cell phone numbers; Power saving mode; Geo-fencing alarm; Support Data logger using Micro SD card