Features: 1. Automatic step-serving device: Recommended for those who want to increase the number of walks! With this phone swing device, pretend you are running, it records steps automatically. 2. Fits for phone under 6.4 inches: Suitable for most 6.4-inch phones or smaller, applicable to most apps such as smart bracelets, Wechat movement, etc. It can also be used as a mobile phone holder. 3. No harm and no noise: High-quality metal bracket is smooth and burr-free, will not scratch the hand and mobile phone, low noise, will not affect sleep when shaking at night. 4. For two phones: The front and back of this swing device can hold mobile phones. 5. Easy to install and use: USB charging or 4 AA batteries (not included) for power supply. Note: 1. Actual color may be slightly different from the image due to different monitor and light effect. Please allow minor deviation due to manual measurement. 2. Battery is not included. 3. Do not insert the battery when USB charging. Specification: Type: Phone swing device Material: metal + plastic Power supply: USB charging or batteries (4 AA batteries need to be prepared by yourself). Applicable phone: Recommended for mobile phones within 6.4 inches. Dual phone version: Both front and back can hold mobile phones Package list: 1 x Phone swing device 1 x charging cable