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 six months.
4. Big and adjustable speaker, clear voice, can be used as mobile interphone.
5. Long working distance, the maximum open distance can reach 300m / 984.3ft.
6. Easy installation, stick directly to the wall with adhesive tape.
7. Outdoor-bell pair with indoor-bell by learning its code, 1 outdoor-bell can paired with N indoor-bells and no interference each other.
8. Made of high quality ABS plastic, exquisite and small, beautiful and high grade.

Specification:
Condition: 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
Distance: Approx. 300m / 984.3ft in the open, 50 - 100m / 164 - 328.1ft in obstacles
Working Frequency: 467.6375MHZ
Working Time: More than half a year
Waterproof Level: No Waterproof Function
Indoor-Bell:
Voltage Range: 5V 1A
Working Temperature: -20-55
Distance: Approx. 300m / 984.3ft in the open, 50 - 100m / 164 - 328.1ft 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