Yes it does !
When pedals are turned backwards for half of a revolution, regenerative braking mode is enabled. Since Rubbee X is an ebike kit with battery, when a long downhill section is encountered the regenerative braking can recharge the batteries. Normal operation is automatically resumed once pedals are turned to move forward. When the batteries are fully charged, the regenerative braking mode will not be available until the batteries are discharged to the allowed limit.