- 2.4GHz digital radio frequency wireless transmission (2400MHz ~ 2483MHz)- USB 2.0 interface- Compact USB receiver included- Wireless range: up to 20 meters (manufacturer rated)- Built-in 640nm red laser pointer- Presenter powered by 2 x AAA batteries- Buttons: prev (up)、 next (down)、 play、 exit、 black screen、 timer mode、 laser switch                                                                                                                                Dimensions: 4.92 in x 1.57 in x 0.71 in<br />Weight: 5.93 oz