That's a surprise collar set for maintenance through the X33 surprise employed in the 2WD off road car YZ-2.
Supported ChassisB-YZ2 / B-YZ2CA / B-YZ2DT / B-YZ2DTM / B-YZ4 / B-YZ4SF / B-YZ2DTMW / B-YZ2DTM2 / B-YZ2CAL2 / B-YZ2T / B-YZ2DTM2S / B-YZ2DTM3 / B-YZ2CAL3 / B-YZ4SF2-1 / MOR-010
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