The WRU S20 has the following functions and features:

Details-
Dimension 80*53*21mm
Weight 157g Button/ Switch 1 power switch (Inside case)
Input Voltage DC 8~92V/1.5A
Internal Battery 300mAh/3.7V
Power Consumption 30-35mA standby current
Internal Battery Life 2.4 hours at 30 seconds time interval,
- 3.6 hours at 600 seconds time interval
Operating Temperature -20°C~70°C
Humidity 5%~95%
LED Light 3 LED lights indicating GPS/GSM/ext- power status
Weight 157g Button/ Switch 1 power switch (Inside case)
Flash Memory 8MB (GPRS data 20400 units, SMS data 320 units)
Sensor 3D Accelerometer
GSM Module SIMCOM 800C
GSM Frequency Band GSM 850/900/1800/1900MHz
GPS Module Quectel L70K
GPS Sensitivity -162dBm
GPS Start Speed Cold start 30s, hot start 2s
Position Accuracy 2.5m
I/O Port 2 Digital inputs – input1 is smart input, can be configured to negative or positive input, default is negative.
- Input2 is positive input for ACC. 1 Analog input, voltage range is 0-12V 1 Output 1 USB port (inside case)