The Knog Blinder Mini Square is a super compact and well-designed light. For a start, it is fully waterproof, so you don't need to worry about protecting it from the elements. It is USB rechargeable but there is a male USB A port cleverly integrated into the light so there is one fewer cable to keep track of. The 30 lumens output by the LEDs is directed in a 20-degree beam for focussed brightness. This makes the light visible from up to 800m away. In its lowest output mode, eco-flash, the light will run for 30 hours. There are 8 different modes to choose from so you'll always be able to find a setting that suits your preference. The clever fastener is simple and easy to use. There are two silicone straps included for mounting on the seat tube, seat post or other frame tubes. These are super smooth and soft so you needn't worry about any paintwork damage.
If you're looking for a compact light for commuting that's impervious to the elements and has long burn times then the Knog Mini Square will be a great fit.