Bluetooth keyboard for smartphone or tablet PC

Specifications 1. 2014 new arrive laser projection keyboard.

2. Small size for portability.

3. cheap price.

2014 New arrive Bluetooth Laser projection keyboard for smartphone; tablet PC or computer.         Specifications:    

Physical Dimension:	36mm x 74mm x 18mm
Weight:	Approx. 40g
Keyboard light source:	Red laser diode
Keyboard language:	English
Keyboard layout:	20.8mm sized QWERTY layout
Projection size:	Approx. 241mm*101mm
Projected Keyboard location:	Approx. 97.9mm from keyboard device
Keystroke Sound:	Built in buzzer(Mute on/off the sound)
Visibility:	Good contrast up to 1800 lux ambient illumination
Detection rate:	Over 400 characters per minute
Detection algorithm:	Multiple key stroke support
Effective key stroke:	Approx. 2mm
Required projection surface:	Non-reflective, opaque flat surface
Power source:	The USB bus power
	Lithium-ion battery power
	The DC input power
Battery capacity:	700mAH(Max) 3.7V Replaceable soft-pack type
Charger:	Rating 800mA @ 5V
Interface:	USB 1.1 and 2.0 for PC
	Bluetooth(v2.0 class 2,class 3 )HID  for Mobile devices
Switch mode:	Switch the active/Standby mode manually
Power consumption:	max. 2.4W 4.2V
Use temperature:	Approx. 0~50°C
Storage temperature:	Approx. -20~50°C
Software compatibility:	All USB HID Compliant OS, All Bluetooth HID Compliant Mobile Device, Windows XP/WINDOWS 7 or Higher, LINUX, Ipad ,Iphone,Android 2.2 or Higher