The Whiz Bang Jr Shunt Sensor is a current sense module that attaches to the standard 50mv / 500A Shunt (MNSHUNT) and wires into the Classic and KID charge controllers to give Amperage readings from the shunt. To use the Whizbang jr (MNWBjr) with any of the Classic Lites, you will either need the local app or an MNGP.