The BBK telephone system includes a base unit and up to two wireless handsets with features such as call display, multiple ringtones, night‑light, and IP search. The devices operate on dual‑mode FSK/VDTMF signaling and provide built‑in clock, alarm, and battery management.
The manual covers hardware installation, power connection, transformer usage, handset pairing (coding), menu navigation for date/time and alarm settings, charging procedures, and a list of common faults with their remedies. This manual is written in Chinese.
| Operating temperature | -10 °C to +40 °C |
|---|---|
| Frequency band | 45 MHz / 48 MHz (20 channels) |
| Modulation method | Frequency modulation (FM) |
| Standard low‑frequency tones | 697, 770, 852, 941 Hz |
| Standard high‑frequency tones | 1209, 1336, 1477, 1633 Hz |
| Power supply (base unit) | 9 V 50 Hz AC via dedicated transformer |