Very good 10Hz GPS, I use to track the timekeeping

I'll start with the flaws, because I would not leave too negative an image that would be absolutely deserved:
-The finish is "Chinese", it makes still a little knock, my strong case very badly for example ... it's annoying because I fixed via double sided scratch on my car, and thus the closure flap wins (and is scratched) every time I want to remove the GPS receiver
-on my Xperia Z1, the device is wrong, or not detected at all: the GPS receiver is royally ignored by all applications "standards" like Waze, Sygic Aura, Google maps etc ... by cons (and fortunately, since it is the first purpose of buying) it is perfectly detected by Racechrono, the soft timing I use Android.

At the positives:
-Excellent Reception, of course. The hot fix take a few seconds, and overall it is much faster than most GPS I owned until today
-L'autonomie Is more than enough time for a day of whole track without getting knots in the brain to see if the battery will hold until the end, it is an undeniable comfort
-The Unit is very easy to use: one button off / 5Hz / 10Hz selection to turn on and refresh rate
-The Output data is of course accurate, and provide valuable information to analyze his times lap by lap. The GPS transmits to the device that receives the data, all the information "NMEA" (this is a standard for GPS info) and thus meets the needs of most users.

In conclusion, I can not recommend this device, you will not be disappointed by what it brings compared to GPS "traditional" (I mean Smartphone GPS away).