1. Holder can be fixed on most of tripod mount and be adjusted to different size 2. Work with many kinds of smart phone, camera etc. 3. Take the perfect individual or group picture to capture every happy moment 4. A button for photo shooting and video recording 5. The head plate with rotating function for different shooting angle 6. Strap hole design, easy to carry 7. The holder with silicone design can protect your device from slip and scratches 8. Compatible with Android and iOS operating system 10. The focus function of "+ / -" is only compatible with Android phones, not compatible with iPhone mobile phones