It's a simple Brake Lamp for bicycle. Just tie on seat-post or hang on your backpack with transparent plastic bag. This simple thing will help you at night when you forgot bring your back light. Putting screen should can see your backside. Screen will Max-Brightness with stop sign when braking. It's Just for emergency use. Depends on your device, sensitivity may different.
The app is created by Maxcom and its category is Tools. Brake Lamp was downloaded and installed by over 10K users and its most recent stable update was on Apr 29, 2011. The average rating for this application is 3.9 on Google Play.
There are ads in the app. A free .apk file of Brake Lamp 1.0.0.A is available from Droid Informer and you can have a look at users' reviews on this site. Prepare 99 KB of free space on your device for this app setup package and keep in mind that it runs on Android 2.3 and higher. According to the antivirus report, the app doesn't contain viruses or any kind of malware.