How to determine the Mercedes-Benz key is dual battery?

Q: How to determine the Mercedes-Benz key is the dual battery?

A: Firstly, you can use ignition switch coil signal detection on keytool max, just make the device close to the door handle of the vehicle, the key is the dual battery if you hear “di di di”voice.

Mercedes Benz Key Dual Battery 1

Secondly,you can generate a new Xhorse PROX Collector and then make it close to the door handle of vehicle.The key is dual battery if you see the LED of Collector blinks.

Mercedes Benz Key Dual Battery 2

Tips: VVDI MB can’t make a dual battery key.