... testerDESCRIPTION:This products can adjust all kind of the RED4 Electronic speed device in-line pump made by Japan Zexel Company ... %, 72.5%, 95%BUTTON INSTRUCTION1. Select Button: When the corresponding indicator light turns off, press ↑ ↓button to adjust PWM value 5 ... ↑ ↓ to choose pre-set rank, and press select button again, indicator lamp power-off,Then reback to the original situation. Under ...