Instruction: Extract information from the supporting document to answer the given question.

Input:
Question: Can someone tell me the device size?
Document: I use it with racechrono on nokia/android. GPS Accuracy is near racelogic's powerbox, very fast start/fix satellites, small size, long life battery
Stopped charging. I thought it was the battery but then realized it's the device itself. I now charge the battery on an old nokia phone which uses the same battery and then place it back on the receiver.
Their response was to call the software vendors. They also informed me that they had the same device and it worked great for them. With no help from them I asked for a refund. They informed me that they would charge me a 25 to 40 percent restocking fee and the return shipping was my responsiblity. I would not recommend purchasing anything from this company!
I can't give you an exact number because the results will vary a tremendous amount by a number of reasons beyond the scope of this review. What I can tell you is that it should be less than 30 seconds, and relatively speaking, it will often be 30% or better than alternative chipsets.3. This unit can track 66 channels at once, giving you more reliable/resilient GPS service.4. This unit is very accurate.
Bought this to work on a custom GPS application for android devices. This thing is great! The GPS data just streams as a raw NMEA stream, and is thus very easy to parse and use.The only problem I had with it is that some of the bluetooth GPS applications (that translate a BT device into a fake location service) on the market don't actually send all 10hz, so I had to write a custom one for myself.
I purchased this from GPS Web Shop. Before I purchased the unit I did a lot of research. It states that the unit is compatible with android devices. The catch seems to be that it does connect via bluetooth but doesn't interface with any of the map programs or I just got a defective unit. I downloaded bluetooth GPS from google play and 3 other similar API's and only 2 would connect to the device. Once connected none of the map programs were able to use the GPS.
I have purchased this product for aviation purposes.I have a software for IPAD which does flight planning and flight tracking . but IPAD's inbuilt GPS is not reliable for aviation purposes.So I have purchased Qstartz 818XtBy default - this device is INCOMPATIBLE with IPAD 2 (IOS 5.1.1) !!! !I had to jailbreak my IPAD and install a third party bluetooth drivers in order to make it work.I took me 6 hours to make it operational.But now...
This is a great little device which is way more sensitive than the built in gps transponder in the nexus 7 tablet. Now using it with Sygic navigation, an offline mapping program. This makes having a data connection via the tablet unnecessary. One point of interest, however.. there's a small software implement called GPS over BT that is required to make your device able to read the gps data. This is in addition to simple BT pairing. Why does no one ever point out these small details?
This characteristic is true of many GPS chips out there, so (as nearly as I can tell) don't bother looking for one that has WAAS at 10 Hz. This unit is definitely state of the art in small, portable, Bluetooth, long-battery life, high update rate, GPS receivers.The GPSView software has a nice feature that, in addition to setting the update rate for the 1 Hz switch position, allows you to select how often *individual* sentences are transmitted.
works well with my nikon 3200
Answer: from the QSTARZ website 72.2mm X 46.5mm X 20mm