Features: This product has remote control function, convenient to use. It is only applicable to draught fan and air conditioner motor of 380VAC(single-phase input, 3-phase output). 0-50Hz frequency control, it supports stepless speed regulation of draught fan motors, draught fans have air blowing-in and blowing-out function. Specification: Name: Variable-frequence speed controller for draught fans, air conditioners, motors Model: JFD Application: Draught fans, air conditioners, motors Power supply phase number: Single phase Shell material: Flame-retardant plastic Remote control battery type: Two AAA batteries (NOT included ) Size: 160 * 120 * 95mm / 6.3 * 4.7 * 3.7in Installation method: Wall-mounted Installation site: Indoor (less than 1 km altitude, no dust, no corrosive gas and no direct sunlight). Applicable environment: -10 ℃ ~ +40℃--20% ~ 90% RH (no condensation) Vibration: Less than 0.5g Protection grade: IP20 Cooling mode: Forced air cooling Package list: 1 * Controller 1 * Remote 1 * User Manual