Knowledge

1.What is TWS?
TWS true wireless stereo, the full name is True Wireless Stereo, Its principle is to turn the two stereo speaker systems into the main speaker and the slave speaker, and from the master speaker to receive the wireless audio transmitted by the mobile phone and other media through Bluetooth, and then wirelessly transmit it to the slave speaker for synchronous playback, thus becoming a wireless stereo system.

2.BT version
Generally speaking, Bluetooth has two branches, namely traditional Bluetooth and low-power Bluetooth BLE. Among them, Bluetooth 1.1, 1.2, 2.0, 2.1, and 3.0 versions belong to traditional Bluetooth, while Bluetooth versions after 4.0 belong to low-power Bluetooth. Traditional Bluetooth is mainly used for audio transmission, file transmission and other scenarios, with high power consumption; while low-power Bluetooth is used for device matching, data synchronization, positioning and other scenarios, with extremely low power consumption and latency, and is widely welcomed by IoT devices.

3.Main Bluetooth IC chip:JL,ACTION,MVSILICON

4.Speaker Horn Size

5.Definition Of Waterproof Rating Of Speakers
The waterproof rating of the speaker is IPXX waterproof and dustproof. The first X is the dustproof level, from 0-6; the second X is the waterproof level, from 0-8. The higher the level, the higher the waterproof level.

6.What's the difference of AM、FM、DAB and DMB radio?
FM:Generally in the shortwave range,analog signals
AM:Generally in the medium wave range, analog signals
DAM:Digital signal broadcasting, i.e. the communication signal is digital and can transmit other forms of signal including high quality audio
DMB radio:Upgrade and evolve to provide multimedia services

7.The difference between active speakers and passive speakers？
Active speakers: Built-in power amplifier circuit, it can work when connected to the power supply and signal input.
Passive speakers: There is no power amplifier circuit inside, and an  external power amplifier is required to work.