Compact Safe: For indoor use; portable safe is ideal for travel, campus, or office use; used to temporarily secure small electronic devices, passports, cash credit cards Great Security: Steel construction; digital combination with delay mode after multiple wrong combination entry attempts (+ override key) Easy To Carry and Secure: Steel tethering cable to secure the lock box to a ground object; carrying handle Durable Design: Soft interior foam lines the interior and protects against scratching and damage Specifications: Exterior dimensions (HxWxD) 7.4 x 25.4 x 20.1 cm; interior dimensions 4.8 x 24.9 x 18 cm; requires four AA batteries (not included)