on an earlier incident, i left my ikey in the booth without realising it... thinking the ikey is in my pocket. i pushed the key button on the booth and it locked readily.... however, upon waling away, i realised i did not have the ikey in my pocket... i went back to my car and tried to open it by pushing the button but to no avail...finally called tan chong and they said they cannot do anything... in the end, i took a cab to my house to retrieve my spare keys and manually opened it... moral of story - keep your spare keys at home!!!