Which wearable/fitness tracker should I get for HIIT?

[atides33]

I've recently started doing HIIT three times a week and I've been using the Scosche Rhythm+ heart rate monitor sync'd to a timer app on my android phone that has my customized intervals set up.

I would prefer to ditch the phone during my workout, but I'm having a hard time finding the right wearable. I have only 3 simple criteria:

1. Interval timer w/ heart rate zones
2. Connects to the Scosche Rhythm+
3. At least 8 silent alarms

The Fitbit Charge 2 fits all the criteria, but most reviews said the silent alarms were too weak to wake them up. The Polar A370 is close, but it only has one alarm. I'm getting frustrated, any ideas?