Lezyne lists these features:

* Incredibly compact, lightweight GPS computer

* No sensors required

* Ultra sharp, easy to read and semi-customizable display with backlight

* Elegant, machined aluminum bevel

* Simple three button operation

* Optimized GPS recording stores up to 100 hours of data

* Scrolling data ticker and auto start/stop functions

* Custom alerts

* Up to 10 hours of runtime

* Micro USB rechargeable

* Weight: 29 Grams

* Includes X-Lock Standard Mount

The X-Lock Standard Mount is very secure. 

To attach and release the computer you have to push it down and twist it. 

This means that it's virtually impossible to knock out accidentally.

The Mini GPS has an IPX7 waterproof rating meaning that it can stand being immersed under 1m of water for half an hour. 

Rain really shouldn't be a problem.

Here's the data you can have displayed:

* Moving time, ride time, elapsed time

* Distance: Current, Trip Total, Trip 2, Odometer

* Speed: Current, Average, Max.

* Elevation: Ascent, Descent, Current

* Laps

* Temperature

* Time: ride time, clock

* GPS signal strength

* Battery life indicator

* Semi-customizable display: 2, 3 or 4 fields

* Manually choose bottom field, or set to auto scroll