How can I tell when my Innoteck DS-7203 Micro Massager is fully charged?

[DeMax]

To know when your Innoteck DS-7203 Micro Massager is fully charged, pay attention to the power switch. While the massager is charging, the switch will flicker. When the battery reaches a full charge, the power switch will remain steadily lit. For optimal performance, charge the massager for at least four hours before its first use. Also, avoid using the massager while it is connected to a charger.