Description: Advanced design: With touchpad to enter the letter directly; Adding the annotation function and the erase writing function based on the general settings. One-click clear: One button to clear all the labels, convenient and fast. Intelligent and always bright laser technology with an effective range of up to 100 meters. wireless transmission technology, low power consumption, stable performance, easy to achieve 20 meters remote control distance Function: It also combines more functions of page up, page down, play slides, black screen for presentation. Applicable operating system: for Windows 98 Se, Me2000, XP, Mac, OS, Linux, Win7, Windows Vista. Specification: Name: wireless laser pointer remote control Product number: 504T Material: ABS Color: Black Type: laser Battery: AAAx2 battery (not included) Voltage, type: 3 V Function: for office and teaching Product size (L x W x H) 13.8x4.0x3.0 cm / 5.42x1.57x1.18 inch Package Includes: 1 Piece Wireless Presenter 1 Piece USB Receiver 1 Piece User Manual Note: 1. the laser is harmful to the eyes, do not look directly at the beam, not point to the face or crowds 2. This product is a second-class Laser Product, not dissemble or air representative by professionals 3. Do not use the telescope and other equipment to observe the red beam 4. Do not use the product for children playing Pay attention: the product does not include a battery. You need to prepare 2 AAA units by yourself.