Laser keyboard projector

Specification: <br /> <br /> <br />- Physical Dimension: 36mmx18mmx74mm <br /> <br />- Weight: Approx. 40g <br /> <br />- Keyboard light source: Red laser diode <br /> <br />- Keyboard language: English <br /> <br />- Keyboard layout: 20.8mm sized QWERTY layout <br /> <br />- Projection size: Approx. 241mm*101mm <br /> <br />- Projected Keyboard location: Approx. 97.9mm from keyboard device <br /> <br />- Keystroke Sound: Built in buzzer(Mute on/off the sound) <br /> <br />- Visibility: Good contrast up to 1800 lux ambient illumination <br /> <br />- Detection rate: Over 400 characters per minute <br /> <br />- Detection algorithm: Multiple key stroke support <br /> <br />- Effective key stroke: Approx. 2mm <br /> <br />- Required projection surface: Non-reflective, opaque flat surface <br /> <br />- Power source: The USB bus power <br /> <br />- Lithium-ion battery power <br /> <br />- The DC input power <br /> <br />- Battery capacity: 700mAH(Max)3.7V Replaceable soft-pack type <br /> <br />- Charger: Rating 800mA 5V <br /> <br />- Interface: USB 1.1 and 2.0 for PC <br /> <br />- Bluetooth(v2.0 class 2,class 3 )HID for Mobile devices <br /> <br />- Switch mode: Switch the active/Standby mode manually <br /> <br />- Power consumption: max. 2.4W4.2V <br /> <br />- Use temperature: Approx. 0~50°C <br /> <br />- Storage temperature: Approx. -20~50°C <br /> <br />- Charge/Use Time 120M/200M