1、Real Time 2 Way Call: This 2 way voice intercom doorbell supports real time two way call, without wiring, without network, without WIFI, one key call, direct two way dialogue, as convenient as making a phone call. 2、Easy To Use: This home doorbell intercom kit is easy to use, you can pair it up successfully in just a few simple seconds (instructions included), with mounting screws and double sided adhesive, multiple mounting methods. 3、Clear Sound Quality: This wireless voice intercom doorbell has clear sound quality, no broken sound on the call, professional duplex call programme to make the communication clearer, and the call volume is adjustable in 4 grades. 4、Built In 800mAh Rechargeable Lithium Battery: This 2 way voice intercom has a built in 800mAh rechargeable lithium battery, the internal battery life is 3‑7 days, the button full battery life is 6 months, the product can be charged using the type C port or charging dock. 5、Long Communication Distance: This wireless intercomunicador has 300 metres real long distance, open space distance up to 300 metres, can cover 1‑4 floors living room, big villa, anti interference, encrypted call design, encrypted call system, reject any interference signal. Item Type: Intercom Doorbell Material: ABS Transmit Power: 0.5W Channel Frequency: 462MHz Receiving Sensitivity: -120dBm Communication Distance: Approx. 300m / 984ft (Open Area) Battery Type: 3.7V Polymer Lithium Battery x 1, Capacity: 800mAh (Included) Number Of Ringtones: 4 Input: 5V 1A Charging Method: USB Charging, Base Charging 1 x Indoor Unit 1 x Outdoor Unit 1 x Charging Dock 1 x Double Sided Tape 1 x Sticker 5 x Installation Screws 3 x Expansion Screws 1 x Plug 1 x Data Cable 1 x Manual