20W Portable Bluetooth teaching Speaker is your good choice.A portable Bluetooth speaker is actually a combination of a rechargeable speaker + Bluetooth receiver. As long as the speaker has Bluetooth function, you can use the Bluetooth connection of the mobile phone. You can try the following steps: 1. Turn on the Bluetooth speaker first, and then turn on the phone. 2. In the phone settings, turn on the Bluetooth function.
The 30W Anti Explosion Horn Speaker has obtained an explosion-proof certificate and has a device to prevent static electricity. It can be used in flammable and explosive warehouses such as oil refineries, synthetic ammonia, paint shops and other horns.
The full name of the power amplifier is the Professional Stereo Power Amplifier, and its function is to amplify the input audio signal to a power sufficient to drive the speaker. In the working principle of professional power amplifiers, there is nothing special from the perspective of amplification. There are two parts of voltage amplification and current amplification inside the power amplifier.