Mini Virtual Keyboard Portable Wireless Laser Projector

Projection size: 10 * 24cm Battery capacity: 700mAh (max) 3.7V Life time: 120 minutes Charging power supply: USB / 5V 500mA Charging time: about 120 minutes Main functions: keyboard function, mouse function Recognition rate: 350 words / minute Light source: red laser light Projection surface: non-reflective, opaque surface Operating surface: any solid surface Frequency range: 2402-2480MHz Modulation system: GFSK version: V3.0, HID Profile Ver 1.0 Keyboard layout: 19mm tilt QWERT