■ Notes While the device functions and scans, vertical lines now appear in the scans. [See photo 3] According to the manufacturer's website and instruction manual, using a separately sold cleaning sheet or calibration sheet might improve this, but I haven't tried it. Therefore, please be aware that this is being sold as a junk item. (I am listing it as "No noticeable scratches or stains" because the item's condition is not bad.) ■ Product Overview Direct scanning to smartphones and tablets Wi-Fi compatible mobile scanner DS-40 Powered by 4 AA batteries. (4 alkaline batteries are included. Compatible with rechargeable batteries.) Of course, a power adapter is included, and USB bus power is also supported. DS-40 Recommended Points "DS-40" pursues mobile use. Built-in Wi-Fi function. Powered by 4 AA batteries. "Security measures" that do not leave data behind. Equipped with AP mode for direct connection to smart devices. Smooth cooperation is possible. Since the Wi-Fi function is built into the main unit, there is no need to purchase a separate option and carry it separately. With the included 4 alkaline batteries, approximately 250 sheets can be continuously read. It also supports rechargeable batteries, allowing for environmentally friendly use. The DS-40 does not store the scanned data on the device. Even if the device is lost or stolen, there is no worry of data leakage, so you can use it more aggressively on the go.