The HT‑B502L telephone provides caller‑ID display, multiple tone and volume controls, anti‑theft protection, and optional music playback. It supports both FSK and DTMF signaling for incoming number detection and includes functions for call history review, deletion, and automatic time stamping.
The manual details how to install the handset, connect to the telephone line, set the date/time, configure regional codes, adjust LCD brightness, and enable or disable features such as anti‑theft and mute. It also offers step‑by‑step troubleshooting guidance for common issues like missing caller ID or poor signal quality. This manual is written in Chinese.
| DTMF frequency range | 1209–1337 Hz |
|---|---|
| Low‑frequency group | 697–770 Hz |
| Side‑tone level (idle) | -6 dBm |
Contact your local telephone bureau to confirm that caller‑ID service is activated for your line.
When the number is shown, press the (删除) key; hold the key for three seconds to delete all stored incoming numbers.