: Rechargeable Li-Ion battery (usually 12V DC input for charging).
For a deep dive into operation, community-driven sites like ManualsLib or Elektrotanya carry various Protek operator's manuals, though you may need to search specifically for the B-series function generators. Protek B801 Technical Specifications protek b801 manual link
To maintain accuracy, the manual details the specific pots or software steps needed for calibration. : Rechargeable Li-Ion battery (usually 12V DC input
(Note: Always ensure you are downloading from a secure, reputable source to avoid malware.) Key Specifications of the Protek B801 protek b801 manual link