Hikvision AX pro Indoor hooter DS-PS1-I-WB（Red）

<table border="1" cellpadding="6" cellspacing="0">
  <tr>
    <th colspan="2">Electrical Characteristics</th>
  </tr>
  <tr>
    <td>Battery Life Span</td>
    <td>Up to 3 years (standby time)</td>
  </tr>

  <tr>
    <th colspan="2">General</th>
  </tr>
  <tr>
    <td>Operation Humidity</td>
    <td>10% to 90% (no condensing)</td>
  </tr>
  <tr>
    <td>Operation Temperature</td>
    <td>-10 °C to 55 °C (14 °F to 131 °F)</td>
  </tr>
  <tr>
    <td>Shell Material</td>
    <td>PC+ABS</td>
  </tr>
  <tr>
    <td>Color</td>
    <td>Blue/Red LED flash</td>
  </tr>
  <tr>
    <td>Weight</td>
    <td>169.5 g (6.0 oz)</td>
  </tr>
  <tr>
    <td>Dimension (W × H × D)</td>
    <td>88 × 88 × 32 mm (3.46" × 3.46" × 1.26")</td>
  </tr>

  <tr>
    <th colspan="2">RF Transmission</th>
  </tr>
  <tr>
    <td>RF Frequency</td>
    <td>433 MHz</td>
  </tr>
  <tr>
    <td>RF Modulation</td>
    <td>2GFSK</td>
  </tr>
  <tr>
    <td>RF Range</td>
    <td>900 m (open area)</td>
  </tr>
</table>