Cable Tray: The cable tray helps the organization of the cable. You may find the cable tray a surprising helper when loosening clockwise or winding the cable counterclockwise. Storage Box: A storage box with a carrying handle secures the entire unit (battery and display) making it easier to store and carry.Speaker: The speaker on the signal receiver allows you to hear the signal beeping from the transmitter to quickly grasp the status of the detection.Headphones: In-ear headphones allow you to clearly hear the signal beeping while avoiding disturbing the surroundings.Protective Sleeves: The protective sleeve can prevent the lens from being damaged by hard objects to extend the service life.Guide Roller: A guide roller with 5 wheels makes the lens more flexible and convenient for shooting different angles.