 Once the user reaches the scooter , he/she unlocks it by pressing START in the mobile appand can now access the tailbox with two helmets (size M and L).
<clarity>  Once the user reaches the scooter , he/she unlocks it by pressing START in the mobile appand can now access the tailbox with two helmets (size M and L).
 Once the user reaches the scooter , he/she unlocks it by pressing a button in the app. The user can then also access the tailbox with two helmets (size M and L).