What is the green number 6 icon like a key?

Key treasure. As the mobile phone client of the elevator floor selection system (compatible with the previous IC card elevator floor selection system), Key Bao uses bionics technology to realize the mobile phone floor selection elevator. It has the following characteristics:

1, say goodbye to the trouble of carrying multiple IC cards, just take the elevator with one mobile phone.

2. If a guest visits, grant the guest permission, and the guest can call the elevator to choose the floor.

3. Simplify the management of property IC cards.