The document describes the features and characteristics of a product from a certain brand.
This manual describes the HT‑W902L telephone’s main features, including DTMF/FSK reception, large LCD display, temperature display, and long‑distance control. It covers installation requirements, battery insertion, and connection to the telephone line.
The guide explains how to configure time, date, area code, outgoing code, caller‑ID settings, contrast, lock functions, and other user‑adjustable options. It also provides a fault‑diagnosis section and emergency handling procedures, plus contact information for after‑sales support. This manual is written in Chinese.
| DTMF frequency error | ±1.5% |
|---|---|
| DTMF signal level (HF) | -6 dBm ±2 dBm |
| Transmission loss (0 km) | 11~12 dB |
Enter standby mode, press the Set key, then press the up key to display the area‑code entry screen, input the code using the numeric keys, confirm with Set, and exit with Delete.
Check that the four 3‑size batteries are inserted with correct polarity; replace them if the voltage is low, then restart the phone.
Caller‑ID depends on the local telephone exchange; if the service is not active, request activation from the telecom provider.