You have no idea if thieves break into your house in your absence? Can you imagine if the light in your house turns on when you open the door? Or do you want your bedroom light to turn off automatically when you enter the living room? Any of your ideas will come true with the Sensor of Door/Window Wireless Sonoff DW2-Wi-Fi. The DW2-Wi-Fi comes in two pieces, the transmitter fits on the door or window and the magnetic key is fixed to the frame. It can help secure your door or window so you know your home is safe wherever you are. The sensor will trigger an alarm for your smartphone to warn you of an intruder when the door or window is opened.

USB2.0 Standard, Backward Compatible, According to RS485 Standard.

We have no idea what USB device you are hooking up to, but if you want to access the microUSB port on something, you might want this.

You can fix it to the wall using screws or double sided tape. Have Command tidy and always at hand with this Simple Support.

The RM433 Remote Control is an advanced version of 433MHz 4-Button RF. Designed with 8 buttons to perform various functions performed on different types of devices. Like fan speed adjustment, brightness setting, etc.

Want to control when one of the devices you have connected to a USB port is turned on or not? With the new Sonoff Micro USB Smart Switch Control, you'll be able to control it on your mobile phone, program it to activate when you need it and whatever you have in mind. With a small size and high performance, this Switch is your best ally every day.

Place this Smart Switch on the power line of any wired device to turn it on and off remotely or to program it automatically. Take control of the connected device using your voice when using this switch with Amazon Alexa or Google Home.

RF Link Transmissor - 434MHz

These wireless receivers work with our 434MHz transmitters. They can easily fit on a breadboard and work well with microcontrollers to create a very simple wireless data connection. Since these are just the receivers, they will only work one way data communication, you would need two pairs to act as a transmitter / receiver pair.

This is a fantastic find for SFE. A small, high-quality, quad-band, standard SMA terminated, cellular antenna.

Multimeter with 50-500V AC 0-100A to measure the current voltage.

Multimeter with 50-500V AC 0-100A to measure the current voltage.

Multimeter with 50-500V AC 0-100A to measure the current voltage.

Multimeter with 50-500V AC 0-100A to measure the current voltage.

The Arduino WTV020-SD MP3 Module is a voice recording module with 1GB SD Card storage capacity. You can upload WAV and AD4 format files that conform to FAT formatting. It supports 6KHz to 32KHz, being 36KHz for AD4 files and 6-16KHz for voice sampling rate (Audio Sampling).