Support audio codecs G.722 and Opus. Built-in 2.4G < 5G Wi-Fi(Y501W/Y501W-E). Support wireless button (Supported specific accessories, via 433MHz wireless transmission). Detachable function buttons. IP54 waterproof and dustproof. Support PoE power supply. Built-in 1 short circuit input/output interface. Support standard 86 box embedded(Y501-E/Y501W-E) and wall mountable(Y501/Y501W).