1) Three options to gain access: code, card and mechanical lock 2) Suitable for apartment, flat, and office, etc. 3) Power consumption: 4-parcel alkaline 5-sized battery (1.5V for 1-parcel) and 1-year endurance 4) ID key capacity: >= 248 times 5) Mechanical key capacity: 5,000,000 times 6) Working voltage: 6V 7) Respond time: 6 seconds