... battery a, a product description, a mounting screw four, a manual handle, lock two keys.Model: BX-1Product characteristic: BX-1 ... waterproof function, simple installation, low failure rateX type power 12V8AH maintenance-free batteries, suitable for convenient external power supply for parking area ... put into normal use;In 2, when the parking car free, controller should be at the highest position;In 3, ...