It can interrupt the supply for pre-programmed periods and at the end of the time period, the supply to the emergency luminaires is automatically reinstated to eliminate battery depletion. · · · Works with any type of lamp · · Key switch for secure access · · 3 pre-set test periods: 10 minutes, 1 hour & 3 hours · · 2.5mm² terminal capacity · · Permanently wired to the emergency luminaire supply