Manufacturer's product page: http://www.royaltek.com/index.php/content/view/98/80/

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Features
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SiRF Star III GPS chipset
20 parallel channels
NMEA0183 compliant protocol
Extreme fast TTFF at low signal level.
High sensitivity acquisition
Power saving features
Industrial Standard
Built-in Re-chargeable battery
More than 8 hrs. of operating time
SBAS(WAAS/ ENGOS) is supported
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RBT-2100 Specification:
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Frequency: L1,1,575.42 MHz
Code:  C/A code
Channels: 20 Channels all-in-view tracking
DGPS Source: SBAS(WAAS,EGNOS)
System Back Up: Replaceable built-in Li-Ion battery 
Operation Time > 8hr at full charge continuous operation mode
Accuracy  
Chipset Sensitivity: -159dBM 
Position: 10m 90% 
Velocity: 0.1 meters/second, without SA 
Time: 1 microsecond synchronized to GPS time
Acquisition Time  
Requisition Time: 0.1 sec.
Chipset Cold Start: 35 sec. @Open sky
Chipset Warm Start: 35 sec. @Open Sky
Chipset Hot Start: 1 sec. @Open Sky
Dynamic Conditions  
Altitude: <18,000 meter
Velocity: <515 meter/second
Acceleration: <4g
Interface  
Connection: Bluetooth(Class 2) Serial Port Profile
Protocol: GGA,GSA,GSV(5),RMC,57600
Power Built-in rechargeable battery and DC input
Battery: 680mAh Li-Ion 
Antenna type: Built-in Antenna
Physical characteristic   
Dimension: 70(L) x 41(W) x 25(H) mm
Weight 62g
Environment  
Operation Temperature: -10 ~ +60
Storage temperature: -10 ~ +60
Relative Humidity: 5% ~ 95%