Back door has a five-pin tumbler system, single-circuitalarm. Child's play.
后门是五锁连环栓，单回路报警系统，小菜一碟。
2
A real-time clock circuit(X1228)is applied to be an hourmeter, data memorizer and alarm in speedometer.
实时时钟电路（X1228）被用作里程表，数据存储器和车速表中的警报。
3
Central air conditioner, automatic fire alarm, closed circuit TV watching system, communication network, public broadcasting and cable TV are all available in the exhibition hall.