HIGH SECURITY:4-digits combination lock, 10000 possible combinations, ultra-high security,the password is difficult to crack,protect your valuables. LARGE CAPACITY:External Dimensions:6.8"X2.6"X1.9"Internal Dimensions:2.8"X1.7"X1.2" Can hold-up to 6 keys of house car padlock portable for indoor outdoor. DUARBLE & ROBUST:The Padlock is made of high-strength zinc alloy, which can withstand sawing and pressing,and can prevent the invasion of sunlight,rain and snow. EASY OPERATION:Reset the 4-digit combination,the number of times required is unlimited,and the instruction manual is placed in the product packaging. WIDELY USED:The key safe box can be used outdoors,where it is used,gyms,shops, houses under renovation,construction sites,rental houses,airbnb etc,your key safe butler.