1* TSDZ2 mid drive motor with torque sensor.1* Speed sensor with magnet.
1* Crank1 pair * Ebrake or Hydraulic brake sensor.(optional)(Ebrake is the basic setting, please leave us a message if you need hydraulic brake sensor.)1* Thumb throttle1* 42T 34T 52T chainwheel(optional)(Attention: The 42T is basic setting ,If you want 52T or 34T.You need to pay extra $10.We can put extra chainwheel in your package.)1* Lcd display
1*Upgrade to light function（optional）
1* Front Light or Rear light