Detailed Product Description Specifications: 1) Variety of sounds to choose from2) Attractive design 3) 30m-100 remote control4) Easy installation, no wiring required5) Uses multifold audio-frequency pulse modulation telecontrol technology 6) Function firm and reliable, strong anti-interference ability, repeating rateless than 1/807) Low power standby 8) Suitable for use in residences, offices, ...