Welcome to our store！</br>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. 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 2 indoor‑bells and no interference each other. 8、Made of high quality ABS plastic, exquisite and small, beautiful and high grade. <div class="wang-edit-text"><div>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</div><style> .wang-edit-text{ font-family:'Arial' !important; } .wang-edit-text table { border-top: 1px solid #000; border-left: 1px solid #000; } .wang-edit-text table td, .wang-edit-text table th { border-bottom: 1px solid #000; border-right: 1px solid #000; padding: 3px 5px; } .wang-edit-text table th { text-align: center; }</style></div> <div>1 x Outside Doorbell</div><div>1 x Inner Doorbell</div><div>1 x Screwdriver</div><div>1 x Manual</div><div>2 x Sticker</div> Satisfaction - Our customers are our top priority. If you find any product problems after receiving the goods, such as damage and incorrect quantity of goods, please contact the seller immediately. We try our best to provide you with satisfactoryaftersalesservice</br>