Extra spare unit for sale! Ready to use out of the box. Open-Sourced Box and Design

MK-312BT (Built In Bluetooth Audio) Have been making and selling these for over a year now. Ships well packed with tracking and insurance! Comes with Charger, 4 pads and 2 cables.

Modern Version of the original ET-312, with improvements in the circuitry and components. Upgraded with built in Bluetooth audio and improved battery for longer life.