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 DoorbellMaterial: ABSBattery: 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 1AOperating Temperature: -20 to 55Transfer Distance: About 1000m in open space, 20-100m through wall, 1-8 floorOperating Frequency: B Band 462MHz, A Band 434MHzOperating Time: About 3 days on a single chargingCharging Time: About 5 hours for full chargingMusic Ringtones: 38 ringtonesRingtone 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 / 4.57x2.20x0.71inWater Resistant Cover: Approx. 121.5x61.5x31.3mm / 4.78x2.42x1.23inCharging Dock: Approx. 70x56x29mm / 2.76x2.20x1.14in.Package List:1 x Indoor Unit1 x Base1 x Outdoor Unit1 x Data Cable1 x Screwdriver1 x Double Sided Tape1 x User Manual