Standard Digital Enhanced Cordless (DECT) Frequency range 1.88 to 1.9 GHz (bandwidth = 20 MHz) Channel bandwidth 1.728 MHz Operating range Up to 300m outdoors; Up to 50m indoors Operating time Standby: 100 hours, Talking: 10 hours Battery charge time: 15 hours Temperature range Operating 0° C to 40° C, Storage -20° C to 60° C 34 Electrical power Base: Ten Pao - S004LB0600030 / S004LV0600030 input 100-240VAC 50/60Hz 150mA, output 6VDC 300mA Charger unit: Ten Pao - S004LB0600030 / S004LV0600030 input 100-240VAC 50/60Hz 150mA, output 6VDC 300mA