ES321 is a 3G (W-CDMA) waterproof GPS asset tracker. Carefully designed for long battery life, it can last 5 years (one report per day) with 7800mAh battery. Embedded with magnets, it can easily attach to vehicle, trailer, container for asset tracking. It will wake up for reporting location information when it senses moving of the asset and power down itself when it is stationary. It supports TCP/UDP and HTTP for reporting location information. ES321 will automatically switch to cell-ID based location reporting whenever GPS is not available.

Main Functions

● Tracking

● 3-Axis Accelerometer

● Message Storage

● Moving Wakeup

● Power Saving Mode

● Battery Low Warning

● Flexible Battery Selection

● Drop Alarm

● Cell-ID Based Location

● OTA (Over the Air)

● Waterproof Case



Physical and Electrical

Dimensions: 86mm*62mm*33mm

Weight: 286g

Battery capacity: 7800/6000mAh

Supply Voltage: 3.3V~4.5V

Power Consumption:

-Active mode:< 72mA @3.8VDC

-Sleep mode:< 5mA @3.8VDC

-Deep Sleep Mode:< 60uA @3.8VDC

Operation temperature: -20℃ to 65℃

Storage temperature (Without battery):

-40℃ to 85℃

3 LEDs for charging, GPS and Cellular status;


Built-in Cellular and GPS antenna

GPS Specification

-162dBm Tracking Sensitivity

Accuracy(Open Sky):<2m (CEP50)

Cellular Communication


ES321A(USA): 850/1900 MHz

ES321JE(Japan/Softbank): 900/2100 MHz

ES321J(Japan/Docomo): 850/2100 MHz

ES321E(Other Countries):900/2100 MHz

Output Power: 0.25W


850/900/1800/1900 MHz

Output Power:

GSM850/900: 2W

DCS1800/PCS1900: 1W


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