Harp on This! Escape Room Prop (w/ Audio)

Fantastic musical laser game!

Brief introduction:
There is a "harp" constructed of 7 laser beams, each with its own notation (the solfège: "do-re-mi-fa-so-la-si"). Adventurers have to play the correct tune on the harp to control the electromagnetic lock.

This product consists of:
1 power adapter
1 controller
7 laser receivers
7 red laser transmitters
1 electric lock

Note:
1. Each cable of the laser receiver is 2M; you can extend it yourself.
2. Max password length is 100 notes!
3. Audio can be modified. 
4. The controller can control a light, lock, or motor.