南非采购需求：黑白超声波、彩色多普勒超声波、心电图、数字X光、病人监护仪

I'm looking to gather detailed information on the various types of handheld ultrasound scanners available in your product line. Specifically, I would like to understand the different models you offer, their features, and any specialized applications they may be suited for. Additionally, it would be helpful to receive a comparison of specifications, as this will assist in determining which device aligns best with our needs. Furthermore, please provide your pricing structure for these handheld ultrasound scanners, including any bulk purchase discounts or special offers. If available, I'm also interested in information regarding warranty options, delivery timelines, and after-sales support. Your prompt response with this detailed info will be greatly appreciated, as I aim to finalize our selection soon. Thank you!