This 2.4 GHz Wireless Remote green Laser-Pointer Presentation Black is small and exquisite, portable and with richer applications. An assistant of demonstrations or presentations, you can point to the or blackboard in any corner of classroom. Making your demonstrations or presentation seem more dynamic and making listeners feel release. Transmitter Technology: Radio Frequency Frequency: 2.4GHz Control Distance: 100m Class II Max Output: Less than 1mW Laser-Distance: 200m Wavelength: 532nm Battery: 600mAh polymer Lithium Working Voltage: 3.7V-4.2V Sleep Current: Less than 160uA Color: black Material: plastic Package Contents: 1 x USB wireless pointer 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. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.