All right. 15 tube crystal water tank controller can take motors up to 4000 watts. 15 tube crystal oscillator controller adopts advanced power electronic module and control algorithm to ensure its high control accuracy and stability. The crystal sink controller is very good. Crystal sink controller is small in size, intelligent, high in stability, good in mute effect, strong in safety performance and strong in expansibility. It is a very practical controller for electric curtains and rolling gates.