Using existing RF circuit in general homes. Sharing of STB, DVD with a few rooms. Flexibility in setting TV format such as PAL/NTSC and Sound IF to accommodate users from all parts of the world. With the wide frequency range of 471.25MHz885.25MHz, selectable transmitting frequency, correspondence frequency display, and built-in memory to minimize and avoid interference. The use of broadcast standard PCB circuit design enhances stability and improves picture quality. Modulates Audio/Video signals to RF signal over coaxial cable. Enables users in different rooms to share and remotely control their Digital Set Top Box, DVR, DVD, or AV Receiver located in the living room. This is achieved by converting A/V signals from A/V equipment into RF signals and transmitting them to various rooms via existing RF circuits. External selection for NTSC/PAL B/G, I, D/K, L, M/N TV formats for global use. Compatible with set top boxes and other A/V sources. UHF modulator with PAL/NTSC selectable. Output channel selectable. USB power supply. RF Frequency Range: 471.25MHz885.25MHz Channel Range: PAL: 2169; NTSC: 1483 Default Factory Setting: Channel 21 (471.25MHz), PAL RF Output Impedance: 75 unbalanced Video Input Impedance: 75 TV Format: PAL/NTSC Sound Carrier Frequency: 4.5/5.5/6.0/6.5MHz Power: USB 5VDC Power Consumption: 1W Item Size: 104x68x24mm / 4.09x2.68x0.94in Item Weight: 80g / 2.85oz Note: Different factory batches do not affect the performance of the product. Color: Black Material: Metal Package Contents: 1 x Modulator 1 x Data Cable Only the above package content is included; other items are not included. Note: Light reflection and differences in display screens may cause slight variations in the color of the item shown in the picture compared to the actual product. Measurement error allowance is +/- 13cm.