This PDF file is a user manual for an intelligent doorbell product called M520. The product is produced by Hikvision. It supports WIFI connection. The document details the features of the product, including: visual intercom, person detection, sound alarm, cloud camera control, two-way voice, infrared night vision, water and dust resistance.
The Ricoh Caplio R4 is a compact digital camera featuring a 7.1x optical zoom lens (28mm to 200mm equivalent) and a built-in image stabilization system to reduce blur from camera shake. It supports high-speed shutter response for capturing fast-moving subjects and offers macro photography capabilities down to 1cm. This manual is written in Chinese.
You can reduce blur by pressing the dedicated camera shake correction button before shooting.