User manual for the 旺德 WD-770 caller ID display multi‑function telephone, covering installation, operation, and troubleshooting.
The WD-770 is a multi‑function telephone with a large LCD that shows incoming numbers, date, and time. It supports FSK/ETSI/DTMF signaling, stores up to 150 incoming call records and 40 outgoing call records, and includes features such as clock display, adjustable ringtone and hands‑free volume, and built‑in lightning protection.
The manual provides detailed instructions for installing the handset, connecting the line, adjusting the LCD contrast, using the memory functions, and performing basic troubleshooting. It also includes a warranty card and guidelines for mounting the unit on a wall. This manual is written in Chinese.
| Display | large LCD with Chinese interface |
|---|---|
| Signaling Compatibility | FSK/ETSI/DTMF automatic compatibility |
| Power | low power, no external transformer required |
| Call Memory | stores 150 incoming numbers and 40 outgoing numbers with timestamps |
| Audio Adjustment | adjustable ringtone and hands‑free volume |
It can store up to 150 incoming call numbers with date and time.
Press and hold the up or down query key for about 3 seconds to switch to contrast adjustment mode.
Check that the ringtone switch is set correctly, the handset is properly seated, and the line box has good contact.
Remove the telephone line, open the bottom, take out the old 4×AA batteries, insert four new 4.5 V batteries, and re‑attach the line.