Specifications: Power Supply Method: Polymer lithium battery Battery Powered: DC5V/1A Working Temperature: -20 ° C~55 ° C Transmission Distance: open space of about 1000m/3280ft, partition walls of 20-100m/66-328ft, floors 1-8 Working Frequency: B-gear frequency 462MHz, A-gear frequency 434MHz Working Time: Charge once for about 3 days Charging Time: Approximately 5 hours when fully charged Music Ringtones: 38 ringtones Ring Volume: Level 3 adjustment (standby machine volume adjustment key) Call Sound: Level 3 adjust call size (adjust volume key during call operation) Product Quantity: 2Pcs Product Colors: Black, White (optional) Product Size: 116 * 56 * 18mm/4.6 * 2.2 * 0.7inch Charging Dock Size: 70 * 56 * 29mm/2.8 * 2.2 * 1.1inch Note: 1. Due to the different monitor and light effect, the actual color of the item might be slightly different from the color showed on the pictures. Thank you! 2. Please allow 1-2cm measuring deviation due to manual measurement. Package List: 2 * Indoor Intercom 2 * Charging Dock 2 * Charging Cable 1 * Instructions 【Long Range Communication】: This wireless voice intercom system boasts a range of up to 1000 meters, making it perfect for use in large homes, villas, factories, hospitals, and more. It uses high-frequency transmission technology to easily penetrate through walls and floors, ensuring clear and reliable communication even in complex environments. 【Easy to Use】: No need for internet or wiring, this device is ready to use right out of the box. It features an intuitive design with talk and battery light indicators for easy operation. It also comes with a charging base for convenient charging, ensuring it's always ready when you need it. 【Emergency Call Function】: Designed with the elderly, children, and pregnant women in mind, this device can be used as an emergency call system. With just a press of a button, help can be summoned immediately, providing peace of mind for both the user and their caregivers. 【Versatile Use】: This device is not only great for home use, but also for offices, and hospitals. It can be used for daily care, bedside calls, emergency calls at night, office calls, and more. It's a must-have tool for anyone who needs to keep in touch with their loved ones or patients. 【High-Quality Design】: With a slim 18mm thickness, this device is lightweight and portable. The buttons are made of plastic and silicone for a comfortable touch, and the surface is treated with high-gloss UV technology for a sleek and modern look. It also features a large 1800mAh polymer lithium battery, providing a 3 Day worth of use on a single charge under normal usage.