Cootree KS-01 Extendable Selfie Stick with Remote Shutter for Smartphones Made of alluminum tube to give KS-01 structural rigidity. When fastened through friction, it will not blend or slide while taking photos with your phones. KS-01 allows quick length adjustments from 13.78to 33.86, simply twist counter clockwise to release, choose your desired length, and twist clockwise to lock. The thickened cell phone holder accepts all popular smartphones width between 56mm-90mm. Bluetooth supports system above IOS 6.0, Most android smartphones above Android 4.1 Built-In Micro USB Port for easy recharging; charging time: 1 hour; standby time: 3-6 months; working time: 20-30 hours