... Extender 4 Selectable channels Function and Features:1. Use 2.4GHz ISM frequency band.2. 250m transmission range.3. Support 4 groups of ... of a wireless router, etc.4. Compatible with DVD, DVR, CCD camera, IPTV, satellite STB, digital TV STB and other AV output ... is fully compatible with remote control signals of DVD, DVR, CCD camera, IPTV, satellite STB, digital TV STB and other AV devices ...