1, hole and outside the emergency telephone extension for column type,
2, the emergency telephone extension adopts hanging type structure, made of stainless steel or aluminum alloy shell.
3, the emergency telephone extension should use one-touch dialing mode
4, the emergency telephone extension built professional lithium battery protection chip, in the normal power supply to the lithium battery, when the sudden power cut, lithium battery to restore power supply quickly, to maintain the normal operation of the system for more than 10 hours.
5, telephone adopts a split type, comprising a microphone, receiver, electronic components and batteries, button, respectively, firmly installed in the call to the upper part of the box, the cable through the bottom of the terminal seat connecting. Easy to transport, easy to install.
6, the emergency telephone extension can increase the GSM module, when the optical fiber is destroyed, automatically to the GSM call

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