Dear Customers, we'v met that a few customers weren't familiar how to use the keyboard or they couldn't use the keyboard correctly so that they felt the product not work. After contacting us they could use the keyboard well. We test all the items before we sent them to you. Please don't hesitate to contact us if you have any questions or problems. We'll try our best to solve all the problems for you and satisfy you. Specifications: • Light Source: Red laser diode • Keyboard Layout: About 19MM tilt, QWERTY keyboard layout • Keyboard Dimensions: 3.94*9.45in (100*240mm) • Keyboard Position: 3.94in (100mm) distance from the transmitter bottom • Projection Plane: Non-reflective, opaque surface • Recognitionrate: 350 words/minute • Operating Surface: Any flat solid surface • Working Environment: 0 ~ 35 ° C / 90% RH • Storage Environment: -5 ~ 35 ° C / ~ 90% RH • Size: 1.50*2.95*0.71in (38*75*18mm) • NW: 64g • External power supply: USB power / 5V 1A • Battery Capacity: Lithium polymer rechargeable battery, 1000mAH (MAX) @ 3.7V • Battery Working Time: 200 minutes • Battery Recharge Time: 120 minutes • USB Interface: USB 1.1 & 2.0, USB HID Ver. 1.0 • Bluetooth: v3.0 (class 2), HID Profile Ver. 1.0 • Frequency Range: 2402-2480MHz • Modulation: GFSK Package included: • 1x Laser Projection keyboard • 1x USB cable • 1x User manual • 1x Microfiber Cleaning Cloth (as a gift) Sold by ESupFly! We're taking legal action to thoes who risk to use our trademark "ESupFly"!
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