TruVision Back Box for 6 Series Varifocal Dome Camera with Wire Harness. Cable outlets on the sides and bottom. It can be used indoors and outdoors. It should only be used on a flat surface. The TruVision TVD-BB4 back box can be used to install the TVD-5604H / TVD-5605H / TVD-5606H Series 6 IP cameras on a flat surface. Physical dimensions: Ø 155 x 36 mm. Material: Aluminum.