You could check out the SmartHalo on Kickstarter - I have one on order (supposed to start shipping in Sept) - it is a start up though, so risks involved there, however it is also a ride tracker (syncs with an app), gps guide and light in addition to having a 105db alarm. The alarm is triggered if the bike is being tampered with.
The advantage of getting in now is you can sign up for their emails and get a 25% off coupon (at least you could when I bought, which was after the kickstarter campaign ended).