索马里采购需求：视频对讲系统、WiFi视频门铃、语音对讲、无线门铃、智能安防摄像头、智能婴儿监视器

I'm looking for a reliable wireless door chime system. It should be completely wireless with no need for any cabling. Features required include multiple ringtone options, adjustable volume levels, and a long remote range for easy usability. Additionally, I need a transmitter that is waterproof and has a durable lifespan for the button. It's important that the system includes an LED flashing light for notifications when the doorbell rings, as well as memory function for ringtones and volume settings even after power loss. Ideally, the device would use digital coding to ensure stability and minimize interference. Looking forward to your suggestions!