<p>Ding : yes, not lower 90DB</p> <p>The battery is equipped with a rechargeable lithium battery (2000mAh)</p> <p>The keys:3 multifunctional buttons</p> <p>Maximum storage capacity of 128GB (TF card format is FAT32)</p> <p>Host size (indoor) 125x78x20mm,sub unit sizes (outdoor) 60x60x13mm</p> <p>Adjustable ringtone:built-in multiple ringtone </p> <p>Charging interface:TYPE-C USB </p> <p>night vision:940nm infrared light\/3 lights</p> <p>Standby power consumption 30uA, Maximum power consumption 300mA (infrared light, screen on) </p> <p>Output format JPG\/</p> <p>Suitable door thickness:40mm-110mm, suitable aperture:16mm-45mm</p> <p>Automatic capture and recording:support </p> <p>Infrared night vision function:support</p> <p>Low battery alarm:supports </p> <p>Adjustable volume:support (0-100)</p> <p>The doorbell function supports a field of view angle of 77 degrees</p> <p>Motion Detection (PIR) support (automatic screen on upon arrival)</p> <p>Colour:As Shown</p> <p>Material:ABS</p> <p>Package Contents:</p> <p>1 * Door Bell Kit</p> <p>Only the above package content, other products are not included.</p> <p>Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +\/- 1-3cm.</p>