Advanced car-kit. The IHF 1000 has all the great features of the HF850 plus more... (1) Voice dial of random number or 20 stored names. (2) Call out of number/name for incoming calls. (3) Superior background noise dampening. (4) Sound can be routed through car-speakers on many vehicles. (5) Generate DTMF tones using your voice while call is in progress, great for handling voicemail or conference call. (6) Mute microphone and more functions with your voice.