Shown here is a interphone.
Feature:

• 5W output power.
• Built-in scrambler.
• Voice compandor function.
• Alarm function.
• High/low switchable.
• Built-in VOX function.
• Frequency stability ± 2.5ppm.
• Wide (25kHz) and narrow (12.5kHz) available.
• Power save function.
• Low battery alert.
• High/low power switchable.
• Time-out timer.
• Voice prompt.

General:

• Frequency range: VHF 137-174MHz; UHF 350-390MHz 400-470MHz.
• Channel No.: 16 channels.
• Channel step: 5kHz/6.25kHz.
• Frequency stability: 2.5ppm.
• Operating temperature: -10℃ to + 60℃.
• Working voltage: 7.4V DC.
• Dimension (H x L x W): 100 x 51 x 29mm.
• Weight: 210g.
• Distances: 3-18km.

Transmitter:

• Output power: 5W/7W regulable.
• Max.freq.deviation: ＜±5kHz.
• Antenna impedance: 50Ω.
• Transmitting current: ≤1300 mA.
• Modulation distortion: ＜5% (300kHz–3kHz).
• Modulated mode: FM (F3E).
• Residualwave radiation: ≤-65dB.

Receiver:

• Sensitivity: 0.20μV (12dB SINAD).
• Operating bandwidth: wide.25kHz; narrow.12.5kHz.
• First IF of receiver: 38.850MHz/26.450MHz.
• Second IF of receiver: 450kHz.
• Squelch sensitivity: 0.16μV.
• Audio power output: ≤1W.
• Standby: 20mA.