Sindoh M403 - Manual (Page 58)

Preparation for Using the Device
1-
30
3
Switch on the device.
Wi-Fi Connection (Option)
(Purchase the Wi-Fi module (PW-DN427) separately.)
1
Check if the other equipment connected to the device is off.
2
Connect the Wi-Fi module to the USB port on the back of the device.
(※ The module is automatically recognized.)
3
Switch on the device.