What do the lights on Sentry mean?

ADS-B Indicator:
Green: Receiving from multiple towers
Yellow: Receiving from one tower
Red: No reception

GPS:
Green: Good fix
Yellow: Weak fix
Red: No fix

PWR:
No Light: 100% Charged
Green: Battery good (>30%)
Yellow: Battery low (<30%)
Red: Battery critical (<20%)
Blue: Charging