BT 4.0 Wireless Connection. BT 4.0 technology, ensures stable connection, no latency, 8m transmission distance.Detachable Cross Button. The detachable cross button, specially designed for fighting games, can be replaced, for more convenience.Colorful LED Buttons. The colorful LED button light, glows at night, more cool and stylish.Comes with Phone Holder. The stretchable phone holder is provided, with the stretching length up to 80mm, and supports 4-5.5inch mobile phones.You can play directly. Just open BT and connect it, very convenient, no drivers. Wide Application. Applicable for smartphone/tablet/smart TV, set-top box, windows.