电话防盗器内置防盗电路.有的还带有蜂鸣器,它对主人使用电话毫无影响。但当有入盗用时.它的蜂鸣器就会发出轻微的报警声.而盗用者在电话中听到的却是刺耳的报警声干扰,同时无法拨号码,从而起到防盗作用。选购时,首先应该检查是否是原邮电部准许入网使用的合格产品。方法就是看它是否有“邮电通信设备进网标志”的入网标识和厂家产品检验合格证。 Telephone anti-theft device built-in anti-theft circuit and some also have a buzzer, it has no effect on the owner to use the phone. However, when there is intrusion, its buzzer will make a slight alarm, while the intruder will hear the harsh alarm sound on the phone and can not dial the number, thus playing a security role. When you purchase, you should first check whether the former Ministry of Posts and Telecommunications approved the use of qualified products. The method is to see if it has a “postal telecommunications equipment into the network logo” network logo and manufacturers product inspection certificate.