Features 1、Brushless Alternator Use: This parallel excitation automatic voltage regulator is used for brushless alternators, very practical. 2、Wide Voltage Range: The AVR monitors exciter field current as a function of alternator output voltage, with input voltage of AC 85‑139V. 3、Flame Retardant Material: Made of flame retardant and heat resistant material, this AVR module is safe and reliable in use. 4、Precise Regulation: The voltage regulator automatically and precisely adjusts and stabilizes the voltage, provides good performance for alternators. 5、Good Stability: Manufactured by exquisite workmanship, professional and standard, the board has great stability. Specification Item Type: Automatic Voltage Regulator Board Material: ABS Model: R230 Working Environment Temperature: -25℃ to 70℃ Package List 1 x Automatic Voltage Regulator Board 1 x Manual