... 2.12v/24V identify automatically 3.PWM function supported 4.12 month warranty PWM 12V/24V 15A solar regulatorSpecification Products ... charger, balanced filling and floating filling 3-sectional series PWM adjust charing ways5Automatic detection and tracking outside and battery temperature ... chip 9Can work in cold ,high temperature,humid environment PWM 12V/24V auto detective 15A solar regulator