This manual explains how to install the HT‑B402L telephone, including connecting the telephone line, inserting the AA battery, and placing the unit in a cool, dry, ventilated location. It also describes the main functions such as DTMF/FSK reception, call display, and various user‑adjustable settings.
Detailed usage instructions cover setting the date and time, configuring anti‑hangup (免打援) features, memory storage, refresh‑time functions, and maintenance tips. The final sections give safety warnings, battery‑replacement guidance, and pre‑repair procedures. This manual is written in Chinese.
| Weight | 830 g |
|---|---|
| Dimensions | L21S × WI54 × H142 mm |
| Power supply | DC 6 V 100 mA 0.6 W |
| DTMF high‑frequency tones | 1209 Hz / 1336 Hz / 1477 Hz |
| DTMF low‑frequency group | 697 Hz / 770 Hz / … |
The phone can store up to 30 call records.