36V10.4Ah(374Wh) Samsung Lithium-ion Battery integrated with brushless controller. Manifold allows an easy removal for diagnosis, repair or replacement of any of the electronic components on the handle bar.   Each connector has a different number of pins so it is important to ensure the connectors are only mated in their original positions as damage may occur to the pins if this procedure is not followed. With two half disks, The sensor just need be stuck on the frame. Very easy for mounting, No need to remove the crank.Also with 12pcs magnets, meet standard EN15194. It detects when you are pedalling. Use the display to vary the amount of pedal assistance you'd like. Stop pedalling and the motor stops.