尼日利亚采购需求：夜视仪、远程摄像机、穿墙监听、伸缩机械手、拆弹服、穿墙监听

I'm looking for high-quality electronic stethoscopes that can match the performance and durability of Littman stethoscopes. Specifically, I'm interested in models that are sleek and thin in design, ideally in black color. It's important that these stethoscopes provide excellent acoustics and comfort, making them suitable for professional use in medical settings. Additionally, please provide details regarding the technical specifications, features, and pricing of the available models. I'm particularly keen on any options that offer advanced functionalities, such as noise cancellation or Bluetooth connectivity. Let me know the minimum order quantities and lead times for delivery as well. Thanks!