Limited-number-of-use neuromodulator apparatuses that may be comfortably worn on the skin of a user to non-invasively apply transdermal electrical stimulation (TES). The apparatuses described herein may be include a flexible/bendable substrate and an elastomeric cover (e.g., formed of an elastomeric fabric). These apparatuses may be simplified, to run autonomously. These apparatuses may also include improved power management features.