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Loudspeaker according to its size, use and use can be divided into several types, each has its advantages. Portable loudspeakers due to the limited size, speaker, power is only 3--8W. Wireless and wired volume size is different, different uses, small suitable for teachers, tour guides, hanging at the waist, put hands to work more freely, and its power is 3W-8W. Large size suitable for outdoor activities, summer camps, extra-curricular lectures and other high traffic places, power in the 35W---95W. Lithium battery type is based on the use of loudhailers in classification made by a. It solves the dry battery pollution on the environment, it is primarily a mobile phone lithium battery technology to a loudspeaker supply.


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