Canon XA20 Instruction Manual page 17

Bottom view
1 Tripod socket (A 28)
2 BATTERY RELEASE switch (A 21)
3 Eye cup (A 24)
4 Identification plate
This plate bears the camcorder ID, which is written as "ID00XX" with "XX"
representing a two-digit number.
Identification plate
1
4
Check here
Names of Parts
2 3
17