Feature:
1. The frequency of use of this product is in accordance with national regulations and will not cause harmful electromagnetic interference, which is universal worldwide.
2. Outdoor‑bell is power supplied by 4pcs AAA battery (not included), easy to replace the battery. Indoor‑bell is used with an external USB data cable.
3. Low power consumption, long standby time for outdoor‑bell up to 4 months.
4. Big and adjustable speaker, clear voice, can be used as mobile interphone.
5. Long working distance, the maximum open distance can reach 200m / 656.2ft.

Specification:
Condition: 100% Brand New
Item Type: Door Bell
Material: ABS Plastic
Color: As Pictures Shown
Outdoor-Bell:
Voltage Range: 4 x AAA batteries (not included)
Working Temperature: -20-55℃
Transmission Distance: Approx. 200m / 656.2ft in the open, 5 - 50m / 16.4 - 164ft in obstacles
Working Frequency: 467.6375MHZ
Working Time: 4 Months
Waterproof Level: No Waterproof Function
Indoor-Bell:
Voltage Range: 5V 1A
Working Temperature: -20-55℃
Transmission Distance: Approx. 200m / 656.2ft in the open, 5 - 50m / 16.4 - 164ft in obstacles
Working Frequency: 467.6375MHZ
Waterproof Level: No Waterproof Function

Package List:
1 x Outside Doorbell
1 x Inner Doorbell
1 x Screwdriver
1 x Manual
2 x Sticker

Note:
Please note that the new type and old type of this product will be sent randomly, and make sure you will not mind before ordering.