DHI-ARD821-W2(868)-L

"• Buzzer Decibel≥105±3dB\1M • Three-level volume control, remote configuration, cloud upgrade and check status (via mobile App) • Built-in battery for up to 2.5 years, and supports low battery alarm • Temperature measurement"

"Two-way RF communication. Provides multiple LED colors to indicate different statuses. Cloud update and automatic recovery from update failure. Offers accidental press prevention. IP54 rated."

"Two-way communication. Displays the status of the LED indicator. Supports cloud update and automatically restores when cloud update fails. Overheating alarm. Sensitivity adjustment."

"Frequency hopping and two-way communication technology ensure that communication is stable. Supports jamming detection and communication encryption. Supports cloud update and automatically restores when cloud update fails. Overheating protection."