It's recommended to replace this IR DIODE chip to support reading new CGDI MB keyless go keys quickly.
3pcs x CGDI MB INFRARED DIODE Chip
1. Please be very careful when you replace the chip, Or you may make damage to device and have to ship back for repairing.
Actually device still works even you don't change this chip. Check CGMB Infrared Diode Operation Instructions
2. This Diode is free of charge and $9.9 is only the shipping cost.