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Specification: Type: Keyboard Projector Model number: K560s Material: ABS Light source: Red Infared Light Keyboard layout: Key distance approx. 19mm, QWERTY layout Width: Approx. 240mm Height: Approx. 100mm Position of the keyboard: It is about 90mm away from the device. Projection surface: Opaque, no reflection plane Recognition rate: > 350 words per minute Operating surface: For any solid plane Battery capacity: Built-in Lithium-ion Battery, 700mAh(MAX) @ 3.7V Charging power supply: USB Power Supply / > 5V 1000mA Input current: 1000mAh(MAX) Output voltage: DC 5V Output current: 1000mAh Bluetooth version: V3.0, HID Profile Ver 1.0 Frequency range: 2402 - 2480MHz Channel number: 79 Modulation system: For GFSK Color: Black Weight: Approx. 139g Package list: 1 * Projection Keyboard 1 * USB Cable 1 * User Manual Notes: 1. Because this product uses infrared rays, strong infrared radiation from direct or reflected sunlight or from tungsten (halogen or incandescent) lighting may cause operating error. 2. Although this equipment is classified as Class 2 laser product, for your safety, do not directly expose your eyes to pattern projection beams or infrared rays. Avoid Below Conditions: 1. Avoid direct sunlight. 2. Avoid low color temperature light source, such as tungsten, halogen, or incandescent lamp. 3. Avoid uneven or irregular surfaces. Place the product on flat surfaces. 4. Avoid a table or surface that is as transparent or reflective as glass or mirror. 5. Avoid placing any objects within the space between the main unit and the laser projected keyboard layout.