With the Abus SmartX 770A U-Lock worrying about losing keys and forgetting combinations is a thing of the past. The lock activates with our cell phones, so we're making sure we're leaving the house with a full charge before a full day of 'go by bike' errands. Smart enough to deter theft, we're enjoying the alarm feature that alerts passerby's and ourselves if someone is trying to cut our lock. The lock is activated by our phone's closeness, so we're saving time while enjoying this futuristic tech.