1. Smartphone holder Easy to use Easy and effortless attachment and removal to / from the ventilation slats in 3 seconds, save half the time. Installation without tools, in just 30 seconds. Optimal viewing angle: 360 rotatable, possible for all viewing angles^ 2. Safety upgrade The clamps are upgraded from nylon to stainless steel to prevent the shrink rod from breaking. The four clamps fasten and secure the cell phone. There is a lock switch on the back of the bracket that can be used to lock the clamps firmly. It should be noted, however, that headphone jacks and cameras can be blocked on some cell phone models^ 3. Material upgrade The clamp is partly made of stainless steel, which is unbreakable and rustproof. On the other hand, made of high-strength ABS plastic with excellent impact resistance, heat resistance, high temperature resistance and wear resistance. The base is made of a special nylon material with excellent toughness, which serves better than conventional plastic or silicone^ 4. Compatibility upgrade Suitable for smartphones, e.g. iPhone Xs, Max, Xs, XR, X8, 7, 7s, 6s, 6 Plus; Huawei Mate 20, 10 Pro, P20; Samsung Galaxy S10 +, S10, S9 +, S9, S8, S7, S6, S5; Note 9, 8, 7, 6; LG; HTC; Sony; Nokia; other Android phones. Note: This mobile phone holder is not suitable for additional batteries. The cell phone should not be thicker than 10mm. Suitable for city bikes, mountain bikes, trekking bikes, all-terrain bikes, racing bikes, motorcycles, electric bikes with a handlebar diameter of 22-32mm