Features: 1. This intercom doorbell kit has stable signal and long working distance. 2. Easy to install. Low power consumption, long standby time. 3. Mainly used in villas, commercial office buildings, private clubs, etc. 4. This suit has two intercoms and one doorbell, with fashionable appearance. 5. Rain-proof design, built-in super-large battery, the appearance is simple and beautiful. Specification: Condition: 100% Brand New Item Type: Intercom Doorbell Material: ABS Frequency Range: 470.000-480.000MHZ Rated Voltage: DC3.7V Lithium Battery: 3.7V 1800MA Antenna Impedance: 50Ω Working Mode: Same Frequency Simplex or Different Frequency Simplex Output Power: ≤5W Modulation Mode (Broadband, Narrow Emperor): 16K F3E, 11K F3E Maximum Frequency Offset (Broadband, Narrow band): <5K/2.5KHz Clutter Radiation: <7uW Pre-emphasis Characteristics: 6dB/ increasing per frequency Emission Current: ≤2.8A CTCSS/ DCS (Broadband, Narrow Band): 0.75KHZ 50Hz, 0.37KHz 30Hz Modulation Sensitivity: 12mV Transmitter: -122dBm (12dBSINAD) Modulation Receiving Wideband: 5KHz Audio Power lifting 1W Audio Distortion: 10% Impedance: ≥85dB Intermodulation (Broadband, Narrow Band): ≥ 60 dB ≥ 55 dB Adjacent Channel Selectivity (Broadband): ≥ 65dB ≥ 60dB) Clutter Suppression: ≥65dB Weight: Approx. 489g Instructions: (1) Long press the TAKL button on the doorbell for 1s, the doorbell sounds "dingdong, ," Sound and transmit the sound and its own identity information to the indoor intercom (The intercom must be equipped with a doorbell function). (2) A walkie-talkie equipped with a doorbell function (and the “Boom” sound) After receiving the “ding DT sound, you need to press the @ key within 15 seconds, Reply to the handshake signal and start the doorbell call channel. (3) The doorbell and the indoor intercom can talk at this time. The process is the same as using the walkie-talkie. When the intercom lasts 15 If no signal is received within seconds, exit the doorbell intercom state, and the intercom will return The normal intercom status is restored and the doorbell goes offline. Remarks: 1. When the walkie-talkie is used as a doorbell, respond to the doorbell signal to And when talking with the doorbell, you must use the TAKL key. Package List: 1 * Doorbell 2 * Intercom 1 * Rain Cover 1 * USB 2 * Sling 1 * Bag of Screws 1 * User Manual .