The MYGUARD Sport LED Armband & Safety Alarm fits the iPhone and similar size phones. It gives you security, safety and convenience all in one: the security of a personal alarm, the safety of a flashing light and the convenience of a cell phone holder. The flashing lights (2 colors and 7 modes) make you more visible to cars or bikes while the 100 dB personal alarm can be utilized if you feel threatened or need to call out for help. The cell phone holder means you always have your phone with you, even when jogging. Additionally, the MYGUARD includes a hidden pocket for cash or keys. It is water resistant up to an IPX4 rating so it can go with you in inclement weather. It is powered by a built-in rechargeable battery that lasts for over 20 hours from a single charge. Also, you can check the charge to see how much battery life is left before you head out the door. Great for biking, hiking, jogging, walking, etc. Compatible with iPhone 5S, 6, 6S, 7, 8 & 10, Samsung Galaxy S4, S5, & S6, HTC One M8 & M9, and Moto X. Fits devices up to 5.5" tall x 2.75" wide or smaller.