How does your wireless device know which one of these to connect to?

You have to understand that this is above consumer grade equipment. This utilized the UniFi controller, and works under the WiFi roaming concept. Think of it like your cellular phone, when you travel from point A to point B over any long distance, you clearly move from one Cell tower to another, seamlessly. This is the same concept, and is part of the WiFi standards. UniFi devices are managed by a single controller, therefore you only create 1 set of settings, not one for each access point. The controller then passes those settings down to each access point that has been adopted in to the network, so they have the same SSIDs. The 802.11 accounts for moving from one access point to another using the roaming standards.

If I buy more than one do I just need one connected to the wired network, if not will leaving one unwired degrade performance?

These are not repeaters, so no, it will not downgrade performance to have one non-wired. This is why using MESH networking is good.

Goal: improve rv park wifi connectivity with a private lan in trailer. can this be setup and connected to the wan port of a typical wireless router?

There are probably many ways to do this. The one I used uses a Ubiquiti NanoStation locoM2 and a Ubiquiti airGateway. The NanoStation receives the parks' WiFi and the airGateway re-broadcasts it within the RV where all your devices can connect to it privately. Search for a blog titled "Private RV Wi-Fi and Making a Better Park Connection for Under $100" for detailed configuration instructions. Works perfectly!

Can i use thin electrical wiring to power the ap with the injector injector? if so, what pins do i punch down into a keystone? thanks

I don't know what you are trying to do but this AP comes with a Power over Ethernet injector. You run a cat5 from your switch/router to the injector, which has a standard 3 prong plug that you plug into an outlet, and then run a cat5 from the output to the AP. That is the only safe and effective way to do this

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Ubiquiti UAP-AC-M-US Unifi Mesh Access Point, White

Ubiquiti UAP-AC-M-US Unifi Mesh Access Point, White

Product ID: 37366529

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Details

Brand
Ubiquiti
Model Name
UAP-AC-M
Special Feature
Access Point
Frequency Band Class
Single-Band
Wireless Communication Standard
802.11a/b/g/n
Compatible Devices
iPhone

⚡24V PoE power delivery

🌐Seamless mesh networking

📶Dual-band 802.11a/b/g/n Wi-Fi

Description

📡 Elevate your Wi-Fi game—mesh smarter, not harder!

PLUG PLAY POWER - Simplify setup with 24V Power over Ethernet—no extra cables, no hassle.
DUAL BAND PERFORMANCE - Enjoy reliable, high-speed connections on both 2.4 GHz and 5 GHz bands for all your devices.
SLEEK MINIMALIST DESIGN - Blend professional style with function in a compact, white access point that fits any modern workspace.
EFFORTLESS MESH COVERAGE - Expand your network with seamless, scalable Wi-Fi that blankets your space without dead zones.
CROSS PLATFORM COMPATIBILITY - Works smoothly with Linux, Mac OS X, and Windows for versatile deployment.

The Ubiquiti UAP-AC-M-US is a compact, dual-band mesh access point delivering robust 802.11a/b/g/n wireless coverage. Powered via 24V PoE and compatible across major operating systems, it’s designed for seamless network expansion with a sleek, professional aesthetic.

Specifications

Wireless Type	802.11a/b/g/n
Brand	Ubiquiti Networks
Series	UAP-AC-M
Item model number	UAP-AC-M
Operating System	Linux, Mac OS X v10.4 Tiger, Windows XP Home Edition Service Pack 2
Item Weight	5.4 ounces
Product Dimensions	1 x 1 x 1 inches
Item Dimensions LxWxH	1 x 1 x 1 inches
Color	White
Voltage	24 Volts
Manufacturer	Ubiquiti
ASIN	B01N9FIELY
Is Discontinued By Manufacturer	No
Date First Available	December 8, 2016

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