STAFF at tycoon Li Ka-shing's home can look forward to a generous Christmas present after they overpowered an armed intruder who slipped through a network of electronic sensors, barbed wire and surveillance cameras. Mr Li said that he had always treated his staff well, but he would make sure the three Filipino helpers had a ''very merry Christmas'' this year. They said they were very frightened when the man, a 30-year-old visitor from the mainland, forced his way into their quarters at about 3 am. A regular police patrol cruised by only minutes before and signed the all clear. Mr Li, his eldest son Victor Li Tzar-kuoi and daughter-in-law Cynthia Wong were in their luxury home at 79 Deep Water Bay Road, Deep Water Bay, at the time of the break-in. But they did not know anything was amiss until police arrived. Once in the home, the man threatened the staff with a knife and a replica handgun and bound and gagged two women and a man, all in their 30s. Gardener Ramon Siao, 40, said the robber burst into the room where he was sleeping with his wife and another Filipino domestic worker and threatened them with a knife and a pistol. ''The robber ordered my wife to tie me and the other domestic helper with tape and told my wife to take him to Mr Li's room.'' The staff told the man their quarters were separated from Mr Li's by a kitchen, which was locked until 8 am. The robber watched over the staff while they waited for the door to be unlocked. But Mr Siao said his brother-in-law, who worked as a watchman at the house, came to fetch him shortly after 6 am when he noticed Mr Li's car had not been washed as usual. ''When my brother-in-law tried to look into our room from the window, the robber threatened us with his knife and ordered us to keep silent. ''At that moment, I freed myself. I grabbed the hand with the weapon and with my other arm held his head, pushing him to the wall. I punched him in the stomach.'' (Cont'd from Page 1) Mr Li was awakened by the fighting. ''At first, Mr Li thought I was fighting with my brother-in-law and asked a Chinese amah to ask us to stop,'' he said. ''When the amah went to my room and saw my wife and brother-in-law and me struggling with the man, she called the police.'' The staff overpowered the robber and tied him up with a rope. It was believed that the pistol was only a replica. Mr Siao gets up at around 5.30 am and cleans Mr Li's car before he goes to golf every morning. ''The security arrangements at the house were very good and this was the first time there had ever been a robbery,'' Mr Siao said. ''I had no idea how the robber could sneak into the house. There were about eight to 10 closed-circuit TVs at almost every corner of the house and five guard dogs in the garden at night,'' he said. Aberdeen Division police questioned the intruder yesterday but refused to release details of his motives or how he gained entry to Mr Li's home. There were signs near the main gate that an electronic sensor or closed-circuit camera had been smashed and repair work was being carried out on electric cables. A metal box marked ''Police'' near the entrance contained a check-in book detailing visits by police patrols over the last month. The last recorded check of the home was made at 2.55 am - about the same time the man was breaking in. The book recorded that checks of the house were made by police two or three times a day. A sergeant signed the book early yesterday. He went to work as police continued their investigation. His mansion is set into the hillside overlooking Deep Water Bay and the golf course below. To outward appearances, Mr Li's house is a fortress bordered by high concrete walls, a sheer cliff and multiple layers of barbed wire. The walls are lined with floodlights and sensors. Closed-circuit cameras and an intercom system are used to screen visitors at the electrically operated front gate. A police spokesman said the daily patrols made of Mr Li's house were part of a programme to cover ''strategic positions'', but would not say why Mr Li's driveway was considered a strategic position. He also refused to comment on how many other such police check-in boxes were in the territory, or whose homes they were located near, ''for operational reasons''.