TL-86C and TL-86A are both national standard 86-type boxes. TL-172 is a 172-type non-national standard box 86C with video output, Bluetooth, power of 3W, digital song selection, music soft start, three-speed time switch machine, lossless format support and other functions. It is the latest model in 214 and the most powerful 86-type background music controller on the market now. The function of model 172 is similar to that of 86C, but it is not as powerful as 86C, but the machine is large, with a screen of 4.3 inches and 86C with a screen of 3. inches. 86A only supports lossless, three-speed time switch machine, no Bluetooth, no video output, no digital song ordering, and only 15W power.