The Quark Smart family is the next generation of FOURSEVENS flashlights, and our most versatile Quark lights yet. With our smart Bluetooth functionality, your flashlight can now communicate with your smart phone. Just grab the FOURSEVENS Smart Flashlights App, available now on the AppStore, and pair your Quark Smart to your phone. The app will allow you to check the current battery life and remaining runtime, configure the modes, and set proximity alarms. And for anyone reluctant to connect their flashlight with their phone, the Quark Smart is still a fully functional Quark light even without pairing. Immediately out of the box, you can easily toggle through all eight output modes by double-clicking the side switch. Holding the tailcap switch will activate the light momentarily without accidentally switching to the next output. As always, our Quark lights are waterproof and constructed with aircraft-grade aluminum and impact-resistant lenses. Quark lights have always been tough enough to meet any challenge. Now they are working harder and smarter to get the job done.