Infiniter brand = superior performance. Lr22gr is infiniter's most powerful rechargeable laser presenter, equipped with full functions of remote control mouse, fully compatible with Mac (apple computer), windows media player and apple's quick time. The built in battery is rechargeable via the usb port of a computer and can save money on battery purchases, thus ensuring it is environmentally friendly. In addition to easily remote control the mouse and ppt slides, both the receiver and presenter body are combined together as one unit with elegant style and ergonomic design with excellent grip feeling and is designed to project green laser light. It uses 2.4 GHz fro remote control technology with direction free features and can even be used smoothly without pointing the receiver. Note: when this product is used in a small meeting room with less than 10 persons, it will be too dazzling. Therefore, in such condition, it is highly recommended to select and purchase our red laser presenter, model lr22r. Infiniter brand = safe, superior performance.