American emergency phone(knzd-16)

Key Attributes.

Matching with most PABX, PBX and PAX systems. 1. Main body with whole stainless steel body, solid and temperature bearable 2. Handset free, loudspeaker, 3. Resume lightning proof protection automatically standard to ITU-T K21 4. Waterproof grade is IP65(can improve to IP67) 5. Hearing Aid Compatible 6. Support hotline call, can realize ring off automatically if the other side close. 7. Totally adopt SMTC craftwork keep very good quality. 8. The design is super thin and smart. Embed style and hanging style can be chosen. 9. Every call is limited(set by five minutes), auto ring off if time exceeded. (Optional) 10. The telephone has passed the certificate of ISO9000(2000) Applications: As Public telephone for indoor or outdoor, elevator phone, Taxi or bus stands or station, Highway call box. Railway, metro, ATM machines side, Tunnel, Port, Dock, Mines, Generation facilities... A good ideal telephone for use in wet or corrosive atmospheres Specification: Main technical indexes: 1. Applicable for various types of SPC exchange and dispatching exchange system with feeding voltage of 48-69V. 2. Ambient temperature: :-30 ~ +60 degreeRelative humidity: 10%~95% Atmospheric pressure: 86~106Kpa Circumstance noise: < 60dB(A) 3. Sound level of ringing: >70dB(A). 1W speaker 4. Standard frequency: low frequency group: 697, 770, 852, 941Hz, high frequency group: 1209, 1336, 1477Hz, frequency deviation: -1.5%~+1.5% If service line is a 3Km signal - level: Standard frequency: low frequency group: -12dB~-6dB, high frequency group: -10dB~-4dB, level difference between low and high frequency of compound signal: 1dB~3dB, 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 Ohm. 6. Super strong function is available for dialing 12 groups of numbers stored in the memory (maximum length of each number is16 digits)