Pattern Projector:Light SourcesRed Laser DiodeKeyboard LayoutApprox. 19mm Pitch, QWERTY LayoutKeyboard SizeApprox. Width:240mm,Height:100mmKeyboard LocationApprox. 80mm from the bottom of deviceProject SurfaceNon-reflective,opaque flat surfaceKeyboard Sensor:Recognition RateApprox. up to 350 characters per minuteOperating SurfaceAny firm flat surfaceElectrical Characteristics:External Power SupplyUSB Power/Less than 5V 500mABattery&CapacityLithium-ion Polymer Battery;600mAh(MAX)@3.7VBattery Operating TimeApprox. 150minBattery Charging TimeApprox.120minBluetoothV3.0,HID Profile Ver 1.0Frequency Range2040-2480MHZChannel79ModulationGFSKEnvironmental Conditions:Operating Temperature0-35°C/90%RHStorage Temperature-5-35°C/90%RHIdentifying Parts Functions:ProjectorUses a red laser to project the image of a keyboard onto a flat surface in front of the typist.SensorPicks up the infred light reflected off the typist's fingers and triangulates the location of the reflected light to determine which key was pressed.This sensor provides a keyboard function.IR LightUses an infrared laser to emit an invisible plane of light a few millimeters above the projection surface so that the infrared light can be reflected off of the typist's fingers to the sensor.ApplicationLaptop,Destop,Smartphone,Ipad,Video Game,IOS,Android,Windows,BlackberryDimensions and Weight:Size78mm*40mm*20mmWeightApprox. 60gPakage Contents:Laser Keyboard1Usb Cable1User's Manual1