Answer:
The Hitune PM-90S requires a 6V DC electrical supply, operating either on 4 x UM-1 dry cells (they are not included) or an external 6V car/motorbike battery connection.
The Hitune PM-90S supports dual power input methods designed for flexible indoor and outdoor industrial deployment:
- Internal Dry Cell Operation: The onboard battery chamber accepts 4 x UM-1 (D-size) 1.5V cylindrical cells (they are not included), combining in series to deliver the required 6V DC operating potential.
- External DC Connection: For stationary or vehicle-mounted emergency marshaling, the unit can be powered directly from an external 6V DC motor bike or 6V vehicle battery line.
- Operational Precaution: To safeguard the internal contact springs from terminal corrosion and electrolyte leakage, always remove internal dry cells (they are not included) when storing the unit between operational deployments.
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