Level's quality craftsmanship and design demonstrate a level of detail not found in any other smart lock. Its unique puzzle piece interface ensures a secure fit in your door and its battery is creatively hidden inside the bolt to make the occasional battery change simple. Level boasts a patent pending, 6-stage, stainless steel gear box that's both powerful enough for the toughest conditions and efficient enough to deliver over a year's worth of battery life from a single CR2 battery. Level exceeds the power and efficiency of other smart locks all within the tiny space inside your door. Engineered from the ground up for strength and durability, Level exceeds the highets industry standards and is stress tested over 1,000,000 cycles. Its mechanical operation is 100% available for reliable egress, never leaving you stranded.