Spec Sheet Preview: The Alpha Communications® / TekTone PK124K battery backup kit provides for continuous battery charging so that if power system equipment is interrupted, standby operating power is provided for up to approximately 6 hours. (Time may vary depending on system size.) Alpha Communications® systems which support the PK124K include NC110N, NC150N and NC200N Nurse Call Systems, DS100 Door Sentry Audible/ Visual Emergency Alarm System, AlphaEcall™ and CM800/CM900 Emergency Alarm System, as well as the NC …