Here is the user manuel for reference: OD11 User Manuel

Here is the user manuel for reference: OG20 User Manuel

Here is the user manuel for reference: OD20 User Manuel

Here is the user manuel for reference: OC20 User Manuel

Here is the user manuel for reference: ENGWE L20 User Manual

Here is the user manuel for reference: ENGWE Pro 2.0 User Manual

Here is the user manuel for reference: ENGWE EP-2 Pro User Manual

Here is the user manuel for reference: Download the 080 User Manual