It WILL WORK with Comcast X1 & RNG150(Cisco), Verizon HD DVR QIP all QIP 7xxx series, Arris VMS & IPC1100, Pace TDC787X HD, PACE TDC575D DVR, DC50X, DCH100, DCX3200, DCX3300, DCX3220c/e, DCX3400-M, DCX3416, DCX3425, DCX3432, DCX3501, DCX 3501-M, DCX3510-M, DCX3520, DCX 3635, DCX700, RNG100, RNG110, RNG150, RNG200N, Cisco CHS435-HDC, CH335-HDC HD DVR, Samsung 150 IT WILL NOT WORK with Motorola DCT or DCH, Series, QIP2500, SA Explorer 4280 HDC, 8300HD, Cisco DTA 30, 50, 1642HDC, 8742HDC, 9865HDC, Verizon Motorola QIP 6416-2 , 6000 series, Motorola/Arris DCX3200-M,DCX3400, DCX3600, DCX3600-M, RNG200. DISH, Direct TV. <> Will not work with any STB without an active 3.5 “IR In” Port, A/V Receivers, TVs or IR Repeater Systems. · WORKS ONLY WITH CABLE Set Top Boxes . Please check your device to be sure you have an active 3.5 mini input port labeled "IR IN". NOT Serial. Contact us if you have any questions about compatibility before you buy.