Byged USB Voice Intercom Doorbells Wireless Doorbell 200M Disdance Indoor Outdoor Interphone System for Home Security

• Volume adjustable and ringtone changeable, the voice quality is clear and the speaker sound is loud.
• Installed easily, can straightly stick doorbell to the wall with adhesive tape and less time consuming.
• Battery take‑in and take‑out easily for outdoor machine, using 4pcs AAA batteries, and service life can up to half a year, but the battery is not included.
• The indoor machine doesn't need batteries, and it is connected with USB data cable.
• Frequency of Doorbell is in line with the national regulations, will not produce harmful electromagnetic interference.

Feature: 1. Frequency of Doorbell is in line with the national regulations, will not produce harmful electromagnetic interference. 2. Battery take‑in and take‑out easily for outdoor machine, using 4pcs AAA batteries, and service life can up to half a year, but the battery is not included. 3. The indoor machine doesn't need batteries, and it is connected with USB data cable. 4. Volume adjustable and ringtone changeable, the voice quality is clear and the speaker sound is loud. 5. Installed easily, can straightly stick doorbell to the wall with adhesive tape and less time consuming. 6. Using learning code to code, an outdoor machine support many indoor machines, non‑interference. Specification: Condition: Brand New Item Type: Doorbell Color: As Picture Shown Material: ABS Plastic The Outdoor Machine Battery Model: 4pcs AAA Batteries for Power Supply (Not Included) Working Temperature: -20-55℃ Transmission Distance: Approx. 200m/218yd of Empty Place, 50-100m/54.6-109.3yd of Place with Obstacles Working Frequency: 467.6375MHZ Working Time: More Than Half a Year Waterproof Rating: No Waterproof Function The Indoor Machine Voltage Range: 5V 1A Working Temperature: -20-55℃ Transmission Distance: Approx. 200m/218yd of Empty Place, 50-100m\54.6-109.3yd of Place with Obstacles Working Frequency: 467.6375MHZ Waterproof Rating: No Waterproof Function Package List: 1 x Indoor Machine 1 x Outdoor Machine 1 x Screwdriver 1 x Discription 2 x Adhesive Tape