$4.95
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I bought the micro USB power supply along with a ZSE11 Q Sensor to substitute for replaceable batteries in the sensor. Call it an upsell, if you will, but it's a very convenient power option, with a convenient link to it right on the Q Sensor product page.
The power supply is fairly compact and plugs directly into an outlet. The plug blades are not polarized, providing options for how it's oriented in an outlet and leaving ample space for a second device to be plugged into the same duplex outlet. The power cable is terminated with a barrel connector compatible with the sensor, and is plenty long enough to allow for flexible placement of the sensor.
All in all, the micro USB power supply is a great little option for wired sensor power. It's conveniently offered and the price is very affordable. Don't hesitate to buy it!
reliable and inexpensive