* charging mode * Rechargeable battery 6V4.0AH * Discharge time is about Single tube: 6 hours / Double tube: 3 hours * Power failure emergency function * Ceiling installation or wall mounting * Analog AC power failure emergency test button * Luminous indicator * Volume: 406 (L) * 76 (W) * 81.5 (H) mm * Package specification: 1*8 sets