From Manufacturer
This B&H Kit includes a black Lume Cube and a Smartphone Mount both from Lume Cube The kit enables you to mount the included Lume Cube to a smartphone that is from 2.5 to 4" wide. This means you can mount the Lume Cube to a smartphone as narrow as an iPhone 4 or as wide as an iPhone 6s Plus or a Galaxy S7. The clamp incorporates a 1/4"-20 threaded mounting hole allowing you to mount it, your phone, and the Lume Cube as a unit, to most tripods.
The Lume Cube features a color temperature of 6000K, so it approximates daylight and emits a maximum output of 1500 lumens. It features an integrated battery and a water resistant skin that is waterproof to 100'; however, do not submerge your smartphone as the water resistance of the Lume Cube does not extend to your phone.