Every day, a large number of old mobile phones are abandoned, which is not only a waste, but also a kind of pollution. We should find ways to continue using these old cell phones. In fact, they are some powerful computers. M-SPEAKER is one way to continue using these old mobile phones, which can turn your old cell phone into a PC WiFi or USB speaker. Mobile phones and computers must be on the same LAN or connected via USB port and run M-SPEAKER at the same time. It is free of charge for basic