Penelope snapped her finger: "Then check Max's residence and his office."

Amy nodded: "And mobile phones."

"Mobile phones are not necessary."

Amy asked, "Why?"

"Don't you forget that Max has to be checked many times before he enters the door. If his mobile phone is passive, it will be found out long ago. Besides, a special help, why should he often take the boss's mobile phone? If it is found out once, it will be easy to be found."

Amy nodded, reasonable.

Penelope thought of something and said, "There is one more thing I think I must remind you. If you find a problem, don't hesitate to tell Max immediately....