2.4Ghz FHSS technology link baby and parent units reliability. Transmission distance up to 300 meters (Open Sight). Wi-Fi detection technology makes this video baby monitor co-exist with Wi-Fi router. Universal joint design gives no limit of view angle no matter where baby unit is placed on table or mounted on the wall/ceiling. Parent unit comes with rechargeable battery. Digital zoom to see baby in detail. Optional features: Talk Back, Room Temperature display, Lullaby.