This projection keyboard will work via Bluetooth HID. connection to main devices， like Tablet PC， Smartphone， Desktop PC and Video game . As a new input device， using the built-in infrared laser transmitter to project the standard keyboard on the working surface ， you can locate the click position and input the information by the method of optical identification. Without physical keyboard， small size， easy to carry， this projection keyboard can adapt to most of the working environment.Feature:100% brand new and high quality.Quantity: 1Compact and ultra-portable for mobilityEnglish QWERTY keyboard layout.Virtual keyboard Connects via Bluetooth wireless technologyEasily pair the laser projection Virtual keyboard with your smartphone， laptop or tabletLithium-ion Polymer rechargeable battery， Mini-B Type charge interfaceCompatible with latest operating systems: Windows XP/VISTA/7/8， Windows Phone 7， IOS4/5/6/7/8(iPhone and iPad) Android 3.1 higher， Mac OS X or HigherSpecification:Pattern Projector:Keyboard light source: Red laser diodeKeyboard layout: Approx.19mm sized QWERTY layoutProjection size: Approx. 110mm(H)*250mm(W)Projected Keyboard location: Approx.100mm from keyboard deviceRequired projection surface: Non-reflective，opaque flat surfaceElectrical Characteristics:Recognition rate: Over 350 characters per minuteOperation Surface: Any opaque flat surfacePhysical Dimension: 38mmx18mmx77mmWeight: Approx. 47gKeyboard language: EnglishCharger: Rating 1A @ 5VBattery capacity: Polymer rechargeable battery，700mAH(Max)3.7VBattery working time: 120 minutesBattery charging time: 200 minutesKeystroke Sound: Built in buzzer(Mute on/off the sound)Visibility: Good contrast up to 1800 lux ambient illuminationEffective key stroke: Approx. 2mmUSB interface: USB 1.1 and 2.0.USB HID Ver.1.0Bluetooth: v2.0(class2)，HID Profile Ver.1.0Frequency Range: 2402-2480MHzChannel: 79Modulation: GFSKEnvironmental Conditions:Working Temperature: Approx.-10~40��C/90%RHStorage Temperature: Approx.-20~40��C/~90%RHPackage Content:1X Laser Projection Virtual Keyboard Mouse (NO Retail Box. Packed Safely in Bubble Bag)1X USB Charging Cble1X User's Manual