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 functions. Using steps Step 1: Install M-Speaker Server on your computer. The computer's operator system must be windows 7/8/10.The download link can be found in M-SPEAKER app. Step 2: Install M-Speaker on your android cell phone. Step 3: Run M-Speaker Server on your computer at first. Step 4: Run M-Speaker on your android cell phone.