There are many models of MPA and PA series which have 120W in power. They are professionally designed for schools, department stores and shopping centres. More kinds of protection for the new series: such as overload , short-circuits of output overheat; and you can use it safely and freely. We also design a fan to protect the power amplifier. The two new series have many acoustic modules, such as MP3 player and recording , ECHO , telephone paging and monitor for option. Each input volume can be controlled with the corresponding individual input volume control, and can be adjusted by means of a master volume and individual bass and treble tone controls. Emergency operation can be made of DC power source 24V, even when AC power fail. They have good performance and supply the excellent quality of sound . Besides , users can operate easily. Please refer to the following table for these models with different acoustic modules.