... /learning/rolling/copy 4.rf remote control multi-channel rf remote control :This product is a wireless remote control,electroplating ,metal in the frames ... using SMT chip comonents,SAW reonator frequency stabilization,with high stability,low power consumption and so on. Characteristics: ... /rolling code(optional) 4.High stability:Adopting imported SMT component SAW and super high frequency audion(6.5G) ...