Key with password remote control function

The invention provides a key with a password remote control function. The key has low cost, and is generally external and firmly mounted on an outer wall of a vehicle or a building. A user can operate from outside but cannot dismount or open the key, while the user can see a mounting mechanism from inside and dismount and mount the key easily. The key with the password remote control function has optical buttons and is fixed on the inner side of window glass, and the user operates the password buttons by touching the window glass from the outside by the finger. The key with the password remote control function is mounted on a dashboard and the periphery of the vehicle so as to facilitate engine starting. An owner can perform matching setting and password setting on the key with the password remote control function. Through password operation, a door can be locked or opened, and the engine and an air-conditioner can be started. The key with the password remote control function can solve the problems of key forgetting and missing and inconvenience in carrying, and realizes functions of low cost, convenience and theft prevention.