This lot is for 4 U6-LR access points (units only) 
They are not in working condition. 
Before they have stopped working, they went offline and online a lot. Eventually, Unifi software stopped detecting them. 
Now, when I connect ethernet cable and try to press reset button there is no response.  

Technical Specifications
Mechanical
DimensionsØ220 x 48 mm (Ø8.7 x 1.9")
WeightWithout mount: 800 g (1.8 lb)
With mount: 930 g (2.1 lb)
Enclosure materialPolycarbonate
Mount materialStainless steel (SUS304)
WeatherproofingIP54
Hardware
Networking interface(1) GbE RJ45 port
Management interfaceEthernet
Bluetooth
Power methodPoE+
Passive PoE, 48V
Power supplyUniFi PoE switch
48V, 0.5A PoE adapter (Not included)
Supported voltage range44—57V DC
Max. power consumption18.5W
Max. TX power
2.4 GHz
5 GHz
6 GHz

26 dBm
26 dBm
MIMO
2.4 GHz
5 GHz
6 GHz

4 x 4
4 x 4
Throughput rate
2.4 GHz
5 GHz
6 GHz

600 Mbps
2400 Mbps
Antenna gain
2.4 GHz
5 GHz
6 GHz

4 dBi
5.5 dBi
LEDsWhite/blue
ButtonFactory reset
MountingWall, ceiling (Included)
Ambient operating temperature-30 to 60° C (-22 to 140° F)
Ambient operating humidity5 to 95% noncondensing
CertificationsCE, FCC, IC
Software
WiFi standards802.11a/b/g/n/ac/ax
Wireless securityWPA-PSK, WPA-Enterprise (WPA/WPA2/WPA3
BSSID8 per radio
VLAN802.1Q
Advanced QoSPer-user rate limiting
Guest traffic isolationSupported
Concurrent clients350+
Supported Data Rates
802.11a6, 9, 12, 18, 24, 36, 48, 54 Mbps
802.11b1, 2, 5.5, 11 Mbps
802.11g6, 9, 12, 18, 24, 36, 48, 54 Mbps
802.11n (WiFi 4)6.5 Mbps to 600 Mbps (MCS0 - MCS31, HT 20/40)
802.11ac (WiFi 5)6.5 Mbps to 1.7 Gbps (MCS0 - MCS9 NSS1/2/3/4, VHT 20/40/80/160)
802.11ax (WiFi 6)7.3 Mbps to 2.4 Gbps (MCS0 - MCS11 NSS1/2/3/4, HE 20/40/80/160)
Application Requirements
UniFi NetworkVersion 6.0.34 and later