1. RK61 is with a ultra compact 61 keys layout, easy to carry. 2. Supports bluetooth/USB wired/2.4G wireless 3-modes connection. Bluetooth connection supports connecting 3 bluetooth devices at the same time, press FN+Q, FN+W, FN+E to switch. 3. USB Cable is a detachable cable design, more convenient for your use. 4. Adopting double shot molding ABS keycaps, nearly 1.5mm thick, durable and anti-wear. 5. RGB backlit displaying, and with 17 backlit modes for option. 6. Multi-devices and three connect modes: RK61 mechanical keyboard can connect up to three devices simultaneously and can switch among them easily. On wired mode, this product is compatible with Window 2000/XP/Vista/7/8/10 and Mac. On Bluetooth Wireless mode, it is compatible with Android and IOS system devices. 7. RGB backlight: 18 RGB backlight modes, 8 monochrome backlight modes and 1 full color backlight. These modes will give you more enjoyable when you gaming or typing at night. 8. Make you enjoyable in your working: RK61 mechanical keyboard with the scientific stair-up keycap design brings comfort, keeping your hand in a natural state to minimize hand fatigue after longtime use and help you typos. So it is designed for gamer, office worker, copywriter, programmer, typing teacher and editors. 9. Product size: 44.5x17.5x3.6cm.