Feature: 1. [Dual Usage Options] With two independent methods for use, press the green button for the other party to respond, or hold down the talk button to speak directly. 2. [Premium Button Design] The buttons feature a combination of plastic and silicone structure with high gloss UV finishing, providing a comfortable and tactile feel. 3. [Long Lasting Battery] Equipped with a 1800mAh polymer li battery, this home doorbell intercom kit can operate for about one week on a single charging, with typical daily usage of 5 times for 30 seconds each time. 4. [Extended Transfer Range] With a transfer range of up to 1000 meters in open areas and 20 to 50 meters through wall, this home intercom doorbell is suitable for a variety of environments and scenarios. 5. [Versatile Sound Options] Offering 38 ringtones and three adjustable volume levels, this 2 way voice intercom enhances the user experience with customizable sound settings. Specification: Item Type: Wireless Intercom Doorbell Material: ABS Battery: Indoor Unit: Polymer lithium battery 3.7V 1800mAh x 1 (built in) Outdoor Unit: Polymer lithium battery 3.7V 1800mAh x 1 (built in) Power Supply: DC5V 1A Operating Temperature: -20℃ to 55℃ Transfer Distance: About 1000m in open space, 20-100m through wall, 1-8 floor Operating Frequency: B Band 462MHz, A Band 434MHz Operating Time: About 3 days on a single charging Charging Time: About 5 hours for full charging Music Ringtones: 38 ringtones Ringtone Volume: 3 levels adjustable (adjust volume key during standby) Call Volume: 3 levels adjustable (adjust volume key during call) Size: Outdoor and Indoor Unit: Approx. 116x56x18mm / 4.57x2.20x0.71in Water Resistant Cover: Approx. 121.5x61.5x31.3mm / 4.78x2.42x1.23in Charging Dock: Approx. 70x56x29mm / 2.76x2.20x1.14in. Package List: 1 x Indoor Unit 1 x Base 1 x Outdoor Unit 1 x Data Cable 1 x Screwdriver 1 x Double Sided Tape 1 x User Manual