Product Name: Super Long Range Cordless TelephoneModel Number: BF-668plusPlace of Origin: ChinaFeatures: 1) Has 16 melodies and 12 ringing tones, 10,000 groups of two-way DTMF code 2) Super anti-interference capacity: 256 group external code-checking switch allows convenient frequency changing, so can be adjusted to certain frequency when interfered outside 3) Wireless PBX system can support five sub-bases or handsets. Can call in duplex or half-duplex 4) Working voltage: AC 85 - 265V; transmitting power is almost 15W 5) Caller ID, fax, Internet indications 6) Optional booster for extending the permissible communication range. It can be called in 48km-128km at open area Inner packing: 1pc/color box + poly-foam protection Outer packing: Export carton