2.4G wireless av sender 250m transmission distance IR Remote Extender 4 Selectable channels Function and Features:1. Use 2.4GHz ISM frequency band.2. 250m transmission range.3. Support 4 groups of channels. You can select these channels to avoid interference from signals of a wireless router, etc.4. Compatible with DVD, DVR, CCD camera, IPTV, satellite STB, digital TV STB and other AV output ...