Data Transfer Rate: 35 (MB/s) Max Read Speed: 25 (MB/s) Max Write Speed: 25 (MB/s) Shell Material: Metal Write Protection Switch: Support Indicator Light: Yes Mobile Phone Function: U Disk Function: Fingerprint Weight: 35(g) OEM: OEM Available Function: 4 in 1 Plug and play, easy to carry. Small and practical, convenient for your life. Note: The first time the device is inserted into a mobile phone or Apple device, a download prompt will appear (Android devices and computers do not need to download). Manual download is not requested; the Apple device downloads automatically the first time an Apple-certified APP user inserts the U disk. A dialog box will appear; click the option on the left to enter the APP store to download and install for free.