Description : > Brand new > Model:VOYE V006B2 > No wiring or drilling.Easy to Install.> Pressing the doorbell button will trigger the wireless receiver to chime. > 38different melodic sounds for selection> 100 meters Remote Control Distance on open flat ground. Power: > door bell: Powered by 2 x AA size batteries for the door bell (battery not included)> remote button :12V 23A battery for the remote button (battery included)Function of bottons : > "LO" : low voice> "MED" : media voice> "Hi" : high voice> "Down" Or "up" : music selectionInstallation: > Two wireless doorbell main units: one upstairs, one downstairs so you"ll never miss a visitor or delivery , or one in house, one in backyard , 100 meters Remote Control Distance on open flat ground , because of Wall spacers, Remote Control Distance in house can only be about 10-30 meters. ) > One wireless remote control: (transmitter unit) with double sided adhesive tape> do not stick on the metal burglary-resisting door directly , Stick the emitter on the outside wall near the door. put the receivers in the house. Once ring the bell, the bell in the house rings.Applilcation : > Useful in home, office, or commercial buildings> Never miss a visitor or delivery again！> This device allows you to choose between different Tune melodies without dealing with all of those annoying wires. The chime is ready to use out of the package. Package : > 1x Doorbell Button> 2x Remote Control Wireless Door Bell> 1x 12V 23A battery