The Bluewire is a Bluetooth 4.0 headset that lets the user record up to 1,000 hours' worth of calls. The device is capable of recording both sides of the phone conversation and is equipped with wireless charging for extra functionality. It also boasts an embedded flashlight and a self-explanatory 'find my phone' feature.
The device also has a burglar alarm mode which is activated via a companion app. Simply attach it to a door and select 'Guard' mode and an alarm will be set off if anyone tries to enter.
The Bluewire Bluetooth headset is currently the subject of an Indiegogo crowdfunding campaign. A pledge of $149 will get you set up with one of these.
All consumer technology these days is ultimately about packing as many useful features as possible into a single package, and the Bluewire does a great job doing exactly that.