Yes, you can still use your Pulse from last year for this year's Challenge. For example, you can use your Pulse from the 2017 Challenge for the 2018 Challenge. You will however need to re-pair your Pulse to your smartphone again.
Note: If you have received a new Pulse for this year's Challenge, we recommend keeping it in a safe place as a back-up!
To re-pair your Pulse, make sure you have the updated version of the Virgin Pulse Global Challenge app. If you do, you simply need to return your Pulse to Standard mode, and then pair your Pulse again!