Remote Key Finder Factory Offer Function: connect the things with receiver, once you press the button of transmitter, the receiver will sound and there the things are. It's rather easy to look for things which you might forget its place. Product model 1) AD1-1, this set includes one transmitter and one receiver 2) AD1-2, this set includes one transmitter and two receiver 3) AD1-4, this set includes one transmitter and four receiver 4) AD1-6, this set includes one transmitter and six receiver Feature 1) around 30 metres transmitting distance 2) hook or stick option to the items 3) stable frequency technique 4) strong long standby time,large battery range,low consumption 5) low battery powertip 6) thin size design(6.5mm) 7) different style&color for plastic shape 8) one press solution for your searching. Parameter 1) Voltage: 12V (transmitter) 3V (receiver) 2) Batteries: 27A 12V for transmitter, CR2032 3V for receiver 3) Remote Distance: 25-30 meters 4) Sound Volume: 85-90 dB 5) Frequency: 433.92 MHz welcome OED & ODM orders please feel free to contact us for more details. thanks