Main OID as .1.3.6.1.4.1.
So the full OID of Product is .1.3.6.1.4.1.45621.2.1

This is from an SNMP walk:
Variable = .iso.org.dod.internet.private.enterprises.45621.2.1.1
name Value = TPDIN-SC48-20
Variable = .iso.org.dod.internet.private.enterprises.45621.2.1.2
version Value = 3.2.2
Variable = .iso.org.dod.internet.private.enterprises.45621.2.1.3
builddate Value = 2017-12-20
Variable = .iso.org.dod.internet.private.enterprises.45621.2.2.1
port1 Value = 0
Variable = .iso.org.dod.internet.private.enterprises.45621.2.2.2
port2 Value = 0
Variable = .iso.org.dod.internet.private.enterprises.45621.2.2.3
port3 Value = 0
Variable = .iso.org.dod.internet.private.enterprises.45621.2.2.4
port4 Value = 0
Variable = .iso.org.dod.internet.private.enterprises.45621.2.2.5
port5 Value  = 0
Variable = .iso.org.dod.internet.private.enterprises.45621.2.2.6
port6 Value  = 0
Variable = .iso.org.dod.internet.private.enterprises.45621.2.2.7
port7 Value  = 0
Variable = .iso.org.dod.internet.private.enterprises.45621.2.2.8
auxport Value  = 0
Variable = .iso.org.dod.internet.private.enterprises.45621.2.2.9
batteryvoltage Value  = 48.0V
Variable = .iso.org.dod.internet.private.enterprises.45621.2.2.10
batterycurrent  = 0.0A
Variable = .iso.org.dod.internet.private.enterprises.45621.2.2.11
inputcurrent  = 0.0A
Variable = .iso.org.dod.internet.private.enterprises.45621.2.2.12
loadpower = 0W
Variable = .iso.org.dod.internet.private.enterprises.45621.2.2.13
batterytemp Value  = 25.0C
Variable = .iso.org.dod.internet.private.enterprises.45621.2.2.14
batterystatus  = 100%
Variable = .iso.org.dod.internet.private.enterprises.45621.2.2.15
inputvoltage  = 0.0V
Variable = .iso.org.dod.internet.private.enterprises.45621.2.2.16
internaltemp = 26.0C
Variable = .iso.org.dod.internet.private.enterprises.45621.2.2.17
batteryVoltageInt Value  = 480
Variable = .iso.org.dod.internet.private.enterprises.45621.2.2.18
batteryCurrentInt  = 0
Variable = .iso.org.dod.internet.private.enterprises.45621.2.2.19
inputCurrentInt  = 0
Variable = .iso.org.dod.internet.private.enterprises.45621.2.2.20
loadPowerInt = 0
Variable = .iso.org.dod.internet.private.enterprises.45621.2.2.21
batteryTempInt Value  = 250
Variable = .iso.org.dod.internet.private.enterprises.45621.2.2.22
batteryStatusInt  = 100
Variable = .iso.org.dod.internet.private.enterprises.45621.2.2.23
inputVoltageInt  = 0
Variable = .iso.org.dod.internet.private.enterprises.45621.2.2.24
internalTempInt = 260