3528 smd led module 1,Free sample 2,stable and weatherproof 3, ... Display Backlighting Instructions:1, SMD with high brightness, suitable in digital LED colorful characters, spurts draws, channel letters, Blister words , various ... effect of different color's character and design3, This module could be linked up to 20PCS, more than 20pcs ... -voltage transmission line voltage drop. 3pcs 3528 smd led module