Characteristic: 1. It is a wireless presenter with a built-in lithium battery, digitron display and vibrating motor, plus The somatic mouse function. 2. The receiver has a built-in TF card socket. If the version you purchased includes the TF card, it Already has u-disk function. The computer aided software is stored in the u-disk. 3. This product replaces the laser emitter which may hurt the user's eyes, using the Following three digital scene modes, its operation is more convenient and powerful. However, you Computer-assisted software must be run before use. 4. You can set the alarm timer before the meeting. When the meeting is over, the presenter will Alerts you by vibrating. You can check the remaining time during the meeting (the remaining time may be Displayed by presenter). 5. The anti-lost function of the receiver can help you not to remember to unplug the USB receiver after The meeting is over. Note: This air mouse needs the program to use it, the program is in the TF card, if you take out the TF card from the adapter, you need to install the program in your computer.