Westgate Lighting ELB-2048 LED 20W Emergency 2 Piece Backup System 48VWestgate Lighting ELB 2048 ELB 2048 Product Description Westgate Manufacturing LED Emergency 2 Piece Backup System 20W 48V DC 90 Minute Features: Meet most of safety standards for lightingStandard CSA C22. 2 NO. 141 UL924 External lithium batteryBattery protections over charge protection overdischarge protection short circuit protectionIndicator shows a variety working modesThe batteries Meet 500 cycles of standard CH andstandard DCHRoHS