This compact wireless transmitter from Accsoon is only 4×۶ cm in size and is therefore easy to attach to your hot / cold shoe. You connect it to your iOS or Android device. You can monitor up to 100m in an open field. In addition, you have a total of 4 channels at your disposal. If you want to connect the Transmitter to your smart device you can do this by downloading the free Accsoon app.