Main features: Matching with most PABX,PBX and PAX systems. 1. Main body with whole stainless steel body, solid and temperature bearable. 2. Handset free, with keypad. 3. Well treated metal keypad against rust and corrosion. 4. Resume lightning proof protection automatically standard to ITU-T K21. 5. Waterproof grade about IP65. 6. The metal shell is provided with grounding connection device and is absolutely insulated with inner circuit and electric, then has the effect of electromagnetism shield. 7. Support hotline call, can realize ring off automatically if the other side close when connecting to external line not exchange system. 8. Totally adopt SMTC craftwork keep very good quality. 9. The design is super thin and smart. Embed style and hanging style can be chosen. 10. The telephone has passed the certificate of ISO9000(2000).