"Ok its a bit pricey but its the only wireless product that is not going to scrape your laminate floor. I have had two installed in a large rented property (lounge & kitchen). Activated by sound the closing system sensitivity needs to be adjusted to the maximum if you don't want it closing every time the carpet is vacuumed. Building Regs were impressed. As the system holds the door open my tenants should not need to resort to the use of illegal door wedges in busy doorways. FreeDor insist on there rep installing the system which probably accounts for the price - its worth shopping around!"