Welcome to our store！</br>1、The speaker is large and adjustable, and the sound is clear, which can be used as a walkie-talkie. 2、Strong and stable signal transmission in the big house, and coverage can up to 200m/656ft (without any obstacles). It is very convenient to respond to the visitor's doorbell at any distance in your room. 3、Low power consumption, outdoor doorbell standby time can up to 4 months. 4、The outdoor bell is powered by 4 alkaline batteries (not included), which is easy to replace. The indoor bell is powered by a lithium‑ion rechargeable battery (built‑in). 5、Easy to install, and the doorbell can be attached to the wall using the included sticker. 6、Compact size, beautiful appearance, high fashion. <div class="wang-edit-text">Condition: 100% Brand New Item Type: Wireless Intercom Doorbell Material: ABS Plastic Color: As the Picture Shows Outdoor Unit Operating Voltage: 3 x AA Alkaline Battery (1.5V x 3) (Not Included) Working Temperature: -20-55°C Transmission Distance: Maximum 200m/656ft (No Obstacles), 5-50m/16.4-164ft (Obstacles) Working Frequency: 467MHZ Working Time: More than 4 Months Indoor Unit Working Voltage: Lithium Ion Rechargeable Battery (Built-in) Working Temperature: -20-55°C Transmission Distance: Maximum 200m/656ft (No Obstacles), 5-50m/16.4-164ft (Obstacles) Working Time: 24 Hours Wireless Frequency: 410-490MHZ <style>.w-e-text table td,.w-e-text table th,.wang-edit-text table td, .wang-edit-text table th{border: .5pt solid #000;};.w-e-text table,.wang-edit-text table{border: 1px solid #000 !important;}</style></div> <div>1 x Indoor Walkie Talkie</div><div>1 x Outdoor Walkie Talkie</div><div>1 x USB Interface Cable</div><div>1 x Screwdriver</div><div>1 x Instruction 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>