of Updating and Improving the Product : Jun 27,2017 : Improvement of the product package : The spic-and-span package is made of the environmentally amiable Cardboard Box. Our whole Customer Satisfaction Guarantee you for puchasing our highest rated doorbells. If you are not 100 % completely contented , simply us to request a refund or exchange ! . Vaskeko battery-free wireless doorbell requires no battery and no wire, biggest save on money every year ! . It a entire spic-and-span level of convenience to your day-to-day, you do not need to search for eldritch battery sizes -LRB- many another wireless doorbells require A23 12V -RRB- and never worry your transmitter runs out of batteries ! . Specifications : FCC, RoHS Range -LRB- Open Field -RRB- : 120 meters RF Frequency : 433 MHz Receiver Sound Level : 85dB @ 3ft -LRB- 1m -RRB- Receiver Power Consumption : Receiver Ring Tone : 25 polyphony ring tones Transmitter rainproof : IPX7 rainproof Class Power Supply : Receiver : AC 110V ~ 120V ; Transmitter : Self-powered Operating Temperature : Receiver : -10 ? . ~ ? . ; : -40 ? . ~ ? . : Receiver : 68 * 86 * 53 mm ; Transmitter : 46 * 88 * 31 mm Weight : Receiver : 80g ; Transmitter : 62g What 's in the Box 1 * Transmitter -LRB- Button -RRB- 1 * Receiver -LRB- Chime -RRB- 1 * Double-sided Adhesive Pad 1 * Button Mounting Base 2 * Screws 2 * Anchors 1 * User extremity .