Specification: Item Type: Wireless Doorbell Material: ABS Application: Home, Shop, Office, Doorbell or Pager Transmitter: Power source: self-generated Ambient temperature: -20-+60 Transmission distance: Open space > 150M RF Frequency: 433MHz Destination: Power Supply: AC110-240V 50/60Hz Power Consumption: 0.25 W Ringtone: 58 Ringer volume: 90 dB Ambient temperature: -10-+45 4-Level Volume Adjustment: The doorbell chime provides 58 melodies to choose from, 4-level adjustable volume, louder than 90dB, meet your different needs. Adjust the volume according to the individual to solve the volume problem. Long Range Wireless Doorbell: The transmission signal of wireless doorbells for home is up to 150m in an open area , long transmission distance, it can be safely applied to various scenarios, such as apartments, houses, offices and other places. Multi-purpose: Not only a doorbell, but also can be a pager, suitable for babies who sleep alone, the elderly, pregnant women. The wireless home doorbell has IP44 sun and water protection, can withstand harsh weather conditions. The working temperature is -10-+45. Easy to install: The installation method of this wireless doorbell is very simple, just plug the receiver into a power source. power supply and attach the transmitter to the wall with the accompanying sticker. No wiring or battery required. Note: 1. Please allow 1-3 mm error due to manual measurement and 1-3g weight error make sure you don't mind before ordering. 2. Due to the lighting of the photos and the difference of monitors, the pictures may not reflect the actual color of the real item. Please make sure you don't mind before ordering, thank you! About Shipping: 1.please pay attention to your delivery address such as: name, street, house number, doorbell/email without name, etc. is correct, or the order will not be delivered correctly. 2.All items will be shipped within 3 business days after the payment is received. Most times you will receive them within 8-12 days then. The specific delivery time is depend on circumstances. 3.During the shopping process, if you have any questions, please feel free to consult us, we will reply you within 24 hours Hope you have a pleasant shopping experience!