MINI F3 Bluetooth Charging Treasure Laser Virtual Projection 2 in 1 Keyboard Type:Virtual Keyboard Application:Laptop Keyboard Standard:Laptop Keyboard Operation Style:Capacitive Interface Type:Bluetooth specification: 1. Light source: red laser diode 2. Keyboard layout: about 19MM tilt, QWERTY keyboard layout 3. Keyboard size: 100mm (H) * 240mm (W) 4. Keyboard position: 100mm from the bottom of the emitter 5. Projection surface: no reflection, opaque surface 6. Recognition rate: 350 words minute 7. Operation surface: any plane 8. Working environment: -10 ~ 40 C 90% RH 9. Storage environment: -20 ~ 40 C -90% RH 10. Size (mm): 84mm 22.5mm 58mm 11. Weight (g): 180g 12. External power supply: USB power below 5V1A 13. Battery capacity: lithium polymer rechargeable battery 5200mAH (MAX) @ 3.7V 14. Battery working time: 30 hours 15. Battery charging time: 3 hours 16.USB interface: USU1.12.0, USB HID Ver.1.0 17. Bluetooth: V3.0 (class2), HID Profile.1.0 18. Frequency range: 2402-2480MHz 19. Channel: 79 20. Modulation: GFSK