1. Cabinet:aluminum alloy die - casting, high anti-violent, able to glisten, convenient for looking for
2. Door cover:orient automatically and good self - closing, convenient for use.
3. Handset:made of special engineering plastic, high anti-knock resistance. high tensile strength resistance and high anti-violent.
4. All of the components including handset telephone receiver and transmitter, keypad, buzzer, circuit board and cabinet are designed to be multi - layer waterproof and dust - proof which is up to Class III grade. The whole machine is up to national standard GB4208-93 IP 66.
5. Phone is provided with high stability, high anti-jamming capability, and it is up to national standard GB/T 15279-94.

1. Applicable for various types of SPC exchange and dispatching exchange system with feeding voltage of 48-60V.
2. Ambient temperature:-30�J~60�J Relative humidity:10%~95%
Atmospheric pressure: 86~106Kpa Circumstance noise:? 60dB(A)
3. Sound level of ringing:?70dB(A).
4. Standard frequency:low frequency group:697. 770. 852. 941Hz,
high frequency group:1209. 1336. 1477Hz, frequency deviation:?��1.5%
If service line is a 3Km signal - level:
Standard frequency:low frequency group:-9dB��3dB, high frequency group:-7dB��3dB, level difference between low and high frequency of compound signal:2��1dB, the total distortion caused by intermodulation of harmonic wave is lower than the basic level by at least 20dB.
5. Call transmission index:(5KM)SLR?12,RLR?-1,STMR?10, output impedance is 600�[.
6. Super strong function is available for dialing 12 groups of numbers stored in the memory (maximum length of each number is16 digits)