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-Monitor-WEB2
Variable = .iso.org.dod.internet.private.enterprises.45621.2.1.2
version Value = 2.2.9
Variable = .iso.org.dod.internet.private.enterprises.45621.2.1.3
builddate Value = 2017-11-18
Variable = .iso.org.dod.internet.private.enterprises.45621.2.2.1
relay1 Value = 1
Variable = .iso.org.dod.internet.private.enterprises.45621.2.2.2
relay2 Value = 1
Variable = .iso.org.dod.internet.private.enterprises.45621.2.2.3
relay3 Value = 0
Variable = .iso.org.dod.internet.private.enterprises.45621.2.2.4
relay4 Value = 0
Variable = .iso.org.dod.internet.private.enterprises.45621.2.2.5
voltage1 Value  = 0
Variable = .iso.org.dod.internet.private.enterprises.45621.2.2.6
voltage2 Value  = 0
Variable = .iso.org.dod.internet.private.enterprises.45621.2.2.7
voltage3 Value  = 0
Variable = .iso.org.dod.internet.private.enterprises.45621.2.2.8
voltage4 Value  = 0
Variable = .iso.org.dod.internet.private.enterprises.45621.2.2.9
current1 Value  = 0
Variable = .iso.org.dod.internet.private.enterprises.45621.2.2.10
current2 Value  = 0
Variable = .iso.org.dod.internet.private.enterprises.45621.2.2.11
current3 Value  = 0
Variable = .iso.org.dod.internet.private.enterprises.45621.2.2.12
current4 Value  = 0
Variable = .iso.org.dod.internet.private.enterprises.45621.2.2.13
temperature1 Value  = 250
Variable = .iso.org.dod.internet.private.enterprises.45621.2.2.14
temperature2 Value  = 250
Variable = .iso.org.dod.internet.private.enterprises.45621.2.2.15
voltage1String Value  = 0
Variable = .iso.org.dod.internet.private.enterprises.45621.2.2.16
voltage2String Value  = 0
Variable = .iso.org.dod.internet.private.enterprises.45621.2.2.17
voltage3String Value  = 0
Variable = .iso.org.dod.internet.private.enterprises.45621.2.2.18
voltage4String Value  = 0
Variable = .iso.org.dod.internet.private.enterprises.45621.2.2.19
current1String Value  = 0
Variable = .iso.org.dod.internet.private.enterprises.45621.2.2.20
current2String Value  = 0
Variable = .iso.org.dod.internet.private.enterprises.45621.2.2.21
current3String Value  = 0
Variable = .iso.org.dod.internet.private.enterprises.45621.2.2.22
current4String Value  = 0
Variable = .iso.org.dod.internet.private.enterprises.45621.2.2.23
temp1String Value  = 25.0C
Variable = .iso.org.dod.internet.private.enterprises.45621.2.2.24
temp2String Value  = 25.0C