Secure A Lid's patented wheelie bin latch/lock automatically unlatches upon garbage collection via a gravity assisted swinging arm. When the wheelie bin is lifted and tilted by the garbage truck, the swinging arm is free to rotate and disconnect from the main latch.   

Wheelie bin latch

wheelie bin lock

This product is only applicable for side loaded garbage pick up.  Side loaded pick ups encompass 95% of all residential garbage collections.  If your garbage is collected via a rear loaded pick up DO NOT buy this product.  The below videos clarify the two methods.