Condition: 100% Brand New Item Type: Wireless Doorbell Material: ABS Plastic Optional Color: Black Silver, White Silver The Outdoor Machine Working Voltage: 3pcs AA Alkaline Batteries (1.5V x 3) (shipped Without Batteries) Working Temperature: -20℃-55℃ Transmission Distance:Approx. 200m / 218yd (without obstacles), Approx. 50-100m / 54.6-109yd (with obstacles) Working Frequency: 467MHZ Working Time: More Than 6 Months Indoor Machine Battery: Lithium-Ion Rechargeable Batteries BL-4C 890mAh (Built-in Battery Shipped) Working Temperature: -20℃-55℃ Transmission Distance: Approx. 300m / 328yd (without obstacles) Approx. 50-100m / 54.6-109yd(with obstacles) Wireless Frequency: 467.6375MHZ 1、This wireless voice doorbell talks with visitors through two?way voice intercom, no wiring, low power consumption, outdoor bell standby time up to six months. 2、15 ringtones can be selected freely, the speaker is large and adjustable, the volume of 3 levels can be adjusted, and the clear sound can reach up to 120 decibels. 3、Easy to install, the doorbell can be fixed to the wall with the attached adhesive stickers, easy to intelligently pair, safe and worry-free. 4、Up to 200M long-distance wireless transmission-powerful and stable signal transmission in a big house, covering a range of up to 200M (without any obstacles). It is very convenient to respond to the doorbell of visitors from any distance in your room. 5、Low power consumption, outdoor doorbell standby time up to six months. The outdoor bell is powered by 3 alkaline batteries (shipped without batteries), easy to replace, and the indoor bell is powered by lithium ion rechargeable batteries. 1 x Indoor Machine 1 x Outdoor Machine 1 x Detachable Indoor Machine Charging Base 1 x Manual 2 x Sticker 1 x Data Line 1 x Screwdriver