Notice: > DC12V/ DC24V COB LED strip CAN NOT directly connect to AC 110V or 220V! Must add DC12V/ DC24V power supply. > The COB strip is jointed by 50cm-strip, so there are some jointed (welding) points on the strip, it’s very normal! Please calculate whether the power supply output of your power supply is consistent with the power of the COB led Strip. If the power supply power is too little will affect the brightness of COB LED strip. Item: COB LED Strip. Working Voltage:12V or 24V. PCB Width: 5mm or 3mm. Power: Width 5mm = 10W/m. Width 3mm = 7W/m. View angle: 180° -Waterproof Rate: IP20 Non Waterproof. Very smooth & balance light, no lighting spot, no dark area. Super bright and soft lighting. Much more bendable and flexible than any other SMD led strip. RA>90, much friendly for eyes. 1x COB Led Strip.