I took this photo a few years ago in Mainland China. It still makes me laugh even to this day. The photo was taken in a city in Shandong. 无线 (wu2 xian4) by itself means wireless. Often when a hotel has wifi in China, it will advertise it as 无线wifi. Though this ad has a simple typo, it massively changes the meaning. If you go to that hotel, it seems you will get a wireless wife included LOL.