The ACC166 has dedicated mounting points for the LG Pro:Centric Smart Ultra HD Set Top Box (STB-5500) and power brick*, making it the perfect accessory to keep your STB mounted and hidden behind the TV. This STB Holder was designed to work specifically with the Peerless-AV® Universal Swing-Out Wall Mount (HPF665). The accessory’s versatile design can be mounted above or below the HPF665’s wall arm.