This particular series has been designed especially for the hospitality industry. The restricted movement offers a very high level of safety from theft or mishandling by anyone, especially children. All of this can be achieved without compromising on fresh air intake into the room. This one of a kind concept, is ideal for hotels who generally do not allow guests to operate windows in their rooms. This also eliminates the need to keep a common master locking device in all the windows thereby making it easy for airing the rooms in between use.