... PSTN switchLanguageEnglish,ChineseFunction Keys4 soft keys, 8 Line keys6 Navigation keys(Arrow button, OK button, C button)Volume adjust, Hands-free,Mute ... and DC12V/1A outputPoE (IEEE 802.af)SpecificationsStorage Temperature:0°C ~ 60°COperating Humidity:10% ~ 90%Size:254mm*205mm*87mmNet Weight ...