Specifications: Can suit both Left and Right hand door (by rotating the lock 180°) NO (open when powered) Fail Secure Operating Mode Can directly connect to aparment Video Door Phone and open door without connect to extra DC 12V power supply (if the video door phone supports NO unlocking mode) High-quality stainless steel High anti-theft and high safety Double lock heads inside and outside With electronic-control unlocking unit and a spring adjusting balance unit Easy to install,User friendly Support manual unlocking, 6 Computer Keys Suitable for : home, offices, schools, hotels, factories, warehouses, etc ***"DC 12V power supply" are not included in this package*** Technical Information: Voltage :DV 9 ~ 12V, 1.5A Power : > 12W Operating Mode : NO (open when powered) Dimensions (strike) : - Approx. 36 (W) x 102 (H) x 51 (D) mm - Approx. 1-3/8" (W) x 4" (H) x 2" (D) inch Dimensions (main body) : - Approx. 123 (W) x 105 (H) x 35 (D) mm - Approx. 4-3/4" (W) x 4-1/8" (H) x 1-3/8" (D) inch Package includes: 1 x DC 12V Electric Release Door Lock 1 x Strike 1 x Outside Lock 6 x Computer Keys 1 x Decorative Ring 1 x Installation Kit