... : GSM double-band 900/1,800, 850/1,900MHz or Quad-band 850/900/1,800/1,900MHz Environment temperature: -10 ... outdoor antennas available (optional) Input voltage: 100 to 240V AC Output voltage: 5V DC Power consumption: < 0.2W Battery backup (optional ... 235mm Packing: 10-piece/carton public Payphone with GSM Double/Quad Band 900/1,800, 850/1,900MHz