How many meters is the mobile phone remote control air conditioning switch mobile phone housekeeper YD238-6 mobile phone remote control?

Hello! It is my pleasure to recommend: the remote control switch of mobile phone, the remote control switch "mobile phone housekeeper card" (YD238-6) uses the wireless network of mobile phone to control electrical appliances. Mobile phones control all kinds of household electronic products and industrial equipment (such as lighting control, air conditioning control, computers, etc.) anywhere in the world. ) Simple operation and convenient use. The telephone remote controller controls and operates household appliances or industrial motors and other electrical equipment anytime and anywhere through fixed telephones or mobile phones. 1: Built-in SIM card, SMS or telephone control, no distance limit. 2. Support direct control of 220V on-off 3. Advantages of humanized voice prompt operation interface: password security control. * No distance limit * No need to carry a remote transmitter with you * No electromagnetic radiation interference problem * No interference effect * No false trigger. If you are not clear, consult online; 13 1 1458868