Super High Sensitivity, Near IR Exposed Single PC Board, w/external sync, adjustable shutter speeds setting and fully adjustable features 440k High:5~50dB Low:5~32dB Internal/External. At 42×42 this double stack board is ideal for covert installations as well as for systems integration where quality low light imagery. The double board provides you the ability to access all features on this unit, all while .maintaining its Ultra Low Light capability!