1. Credit card swiper
Realize bank card payment function through 3.5 Audio Plug on mobile phone, representative product: Lakala
2. Smart buttons
The small button at the top of the smart key can be pressed to open flashlights, dialing and other common functions through the 3.5 Audio Plug
3. Universal remote control
Matching corresponding APP, you can control TV, air conditioning and so on through infrared ray
Step 4: Flash
Highlighting LED lights can enhance the phone's shooting and provide features such as time-lapse selfies
The functions of these gadgets vary, but the basic principle is the same:
The received information is read and encoded into an audio signal, which is sent to the mobile phone through the microphone terminal. The APP on the mobile phone reads the audio signal, samples and decodes the digital information, and sends the processed new information out through the headset terminal.
3.5 Audio Plug also has certain power supply capability. With it as the transmission medium, it can realize various ways of charging (supplying) electricity, transmitting data, and remotely controlling other devices.
