The RECCO rescue reflector is an additional safety tool and does not replace a transceiver. The transceiver makes you searchable to your companions, whereas the RECCO rescue reflector makes you searchable to professional rescuers.
A backcountry skier should always carry a transceiver, shovel and probe, and wear a RECCO reflector as a backup, should the transceiver's batteries fail, or the device is turned off.
Learn more about avalanche safety here, and our safety booklet The Plan for more safety recommendations.