Durable Materials: This waterproof safety box is primarily made of ABS and stainless steel, offering rust resistance and wear durability for a robust and sturdy design. The interior lining protects contents from impacts and damage, ensuring your items remain safe and secure. Large Capacity: Interior dimensions: 20.5 x 10.5 x 4 cm; exterior dimensions: 24 x 14 x 5.8 cm; lock cable length: 50 cm. This safety box offers ample storage space for all your essentials. High Security: This safety box is perfect for beach use and features a 4-digit combination lock with up to 10,000 possible combinations. It's easy to set and change your password. The default combination is 0-0-0-0, and you can easily reset it to your own code. Please note that once the password is reset, it is advisable to take a photo of it for your records, as you will not be able to access the box again without it. How to Open the Lock Box Smoothly: After entering the correct password, gently tap the top of the lock box several times (as the product is waterproof and fully sealed) to allow some air to enter, breaking the vacuum seal. Finally, apply force to lift the top lid of the lock box. Versatile Use: This product features a portable size and secure design, making it perfect for home, hotel rooms, offices, cars, dorms, campers, or beach trips. It is designed to protect jewelry, phones, wallets, MP3 players, and other small but valuable items that are particularly prone to theft. This makes it an excellent gift for family and friends.