1. [Ergonomic Design] Unique curved design, the wireless presenter remote concompatible withms to ergonomics, so it will not be sore when held compatible with a long time. 2. [Wireless Connection] Using 2.4Ghz wireless technology, the presentation remote pen can remotely control the demonstration at about 10 meters. 3. [Multi Functions] Comprehensive slide presentation functions, including compatible withward, return, pause, start and black screen functions 4. [Wide Application] This wireless presenter remote is a practical tool compatible with teacher and worker to present compatible with speech, meeting or class. 5. [Widely Compatible] This presentation clicker is suitable compatible with Win 98,compatible with Win se, compatible with Win me, compatible with Win 2000, compatible with vista, compatible with OS X Item Type: Presentation Clicker Control Distance: Up to 10m(Approx. 10m / 10.9ys) Adapter Battery: 1 AAA Battery (Delivery Without Battery) Compatible Interface: USB 1.0 / USB 2.0 Uses: Conferences, Lectures, etc. Compatible System: compatible with Win 98,compatible with Win se, compatible with Win me, compatible with Win 2000, compatible with Win xp, compatible with vista, compatible with OS X Colour:black Material:plastic Package Contents: 2 x Presentation Clicker 2 x Wireless Receiver Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.