Its a bit like an Amazon Dash Button, except that:
you have to build it & code it yourself
It connects through to Pantri
you can associate a button to any grocery item that you want (in the Pantri Dashboard)
The device is a self assembly kit that a hobbyist electronics maker can solder together, before programming the onboard ESP-8266 microchip with Arduino code, to send grocery usage information up to the Pantri API each time it is pressed.
The device is available for sale on the M-Appliances website.