Remote Control Pairing:At the same time, press the power button of the remote control and turn signal, when the turn signal flickers three times in red, it means the pairing is successful.Turn Signal Installation:1.Take out the turn signal and the fixed support in the packing box, along the grooves, slide the fixed support in grooves and snap the buckle.2.put the loaded turn signal on the bicycle seat tube and tighten it with screws. If it is too loose, you'd better to add a rubber gasket. (the turn signal is suitable for the seat tube size: 25-32mm).Remote Control Installation:Take out the remote control and then install it on the bicycle handle, tighten it up with a screwdriver. The remote control is suitable for the handle size: 18-28mm.Product specifications:Dimensions (W x H x D): 111.6*30*33.8mmWeight: 125gWaterproof Grade: IPX4Power Supply : DC 5V 1ARed Warning Light Luminance: 85 lumenBattery Capacity: 2200mAh(bike tail light)/180mAh(remote control).Endurance Time: Work for about 7 hours under constant brightnessCharging Time: The charging time is about 2-3 hours.Thank you very much for your trust and support, and I wish you a happy life.