... quality 4.Special size is ok 5.Long lifetime. Ultra Slim Led light box specification: (1) Normal Size: A4,A3, A2 ... , silk prink frame, T4/5 OR LED lighting source. Ultra slim, four side open.(4) Long life time 60000HOURS,3W-6W ... will be 2000 -3500k .· Easy to install and change pictures.· Slim & Waterproof. High brightness.Professional quality.· Logo can be silk screen ...