4M KidzLabs Spy Science: Money Safe with Alarm. Probably the most secure money safe in the world. Create and set the digital lock and install the alarm. Then challenge your friends and family to crack your safe. Fun project to learn how a lock works. This set contains: - Plastic money safe - Electric alarm - Electric wires - String to sound the alarm - Metal pins - Battery holder - Detailed instructions Works on 1 AA battery (not included). Suitable for children from 8 years. Box dimensions: 24 x 22 x 6 cm