... Lithium Battery - Excellent voice quality - Wholesale Model: GSM/900//1900MHZ wireless fixed phone FWP-930 Key Technical Specifications1,Environmental temperature:-10 ... Humidity:10%~90%3,Working Frequency:GSM/900//1900MHZ (850/1900 MHZ)4,Working Voltage:AC100-220V,50HZ,DC ... ×W169×H57MMFunction SpecificationsBasic Calling FunctionTurn ON and Off the wireless phonePlease press the red“ ”key on the keypad ...