1。身体健壮的铝合金压铸的SMC。汪达尔人耐药及防伪硬件,安装简单。2。自动拨号,当你拿起手设置手机将通过。3所示。天气对IP66标准,服务温度范围:-35度到+ 75度4。磁簧挂钩开关5。电话线路供电。不需要外部电源或电池备份。 6. Lightening protection to ITU-T recommendation K.21 7. Handset: made of special engineering plastic, high anti-knock resistance, Weatherproof, armoured cable optional 8. Hearing Aid compatible receiver, Noise canceling microphone. 9. Handset integrity wiring to enable the telephone system to check if the telephone unit is still operational. 10. Selectable 7 minute time out, to release the line if the handset is left off hook. 11. Ingress Protection: GB4208-93 IP66 EMC: EN55022/EN55024/EN50121-3-2: 2006 FCC