the instant invention is a compact carabiner locking mechanism contained within the carabiner gate . the locking mechanism incorporates a means to block movement of the gate return spring mechanism and subsequent movement of the gate . a low profile external button is pushed to unblock the gate return spring mechanism , which enables the gate to be opened . the button is recessed to prevent inadvertent activation . furthermore , the button is located so that the carabiner gate can be conveniently unlocked , opened and relocked with one hand .