To modulate Audio or Video or signal to RF signal over coaxial. With this product, user in the room can share and remote control their Digital Set Top Box, DVR, DVD. AV Receiver which are placed in the living room. This is made possible by converting the A or V Signal from the A or V equipment to RF signal and send to various rooms over RF circuits. Features: Using existing RF circuit in general homes. Sharing of STB, DVD with a few rooms. Flexibility in setting TV format such as PAL or NTSC and Sound IF to accommodate users from all part of the world. With the wide frequency range of 471.25MHz-885.25MHz, selectable transmitting frequency and correspondence frequency display and in built memory will minimize and avoid interference. The use of broadcast standard PCB circuit designed enhanced stability and better picture quality further. External setting for NTSC or PAL B or G,I,D or K,L.M or N TV formats for global use. Compatible with set top boxes and other A or V sources. UHF modulator - PAL or NTSC selectable. Output channel selectable. USB power supply. Specifications: RF Frequency Range: 471.25MHz-885.25MHz Channel Range: PAL: 21-69 NTSC: 14-83 Default Factory Setting: Channel 21 (471.25MHz).PAL RF Output Impedance: 75 unbalanced Video Input Impedance: 75 TV Format: PAL or NTSC Sound Carrier Frequency: 4.5 or 5.5 or 6.0 or 6.5MHz Power: USB 5VDC Power Consumption: andle 1W Material: ABS Item Size: 104 x 68 x 24mm or 4.09 x 2.68 x 0.94in Item Weight: 80g or 2.85oz Package Weight: 122g or 4.30oz Package Size: 13.2 x 10.5 x 3.2cm or 5.20 x 4.13 x 1.26in Package List: 1 x RF Modulator 1 x USB Cable 1 x Manual (English)