Main Features:Matching with most PABX,PBX and PAX systems.1.Main body with whole stainless steel 304 body, solid and temperature bearable2.Handset free, loudspeaker,3.Resume lightning proof protection automatically standard to ITU-T K214.Waterproof rate to IP655.Support hotline call, can realize ring off automatically if the other side close.6.Totally adopt SMTC craftwork keep very good quality.7.The design is super thin and smart. Embed style and hanging style can be chosen.8.Every call is limited(set by five minutes),auto ring off if time exceeded. (Optional) 9.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, Highwaycall box. Railway, metro, ATM machines side, Tunnel, Port, Dock, Mines, Generation facilities…. A good ideal telephone for use in wet or corrosive atmospheres