diff --git a/Drive-Overview.md b/Drive-Overview.md
index e14fac9..b4ce9b6 100644
--- a/Drive-Overview.md
+++ b/Drive-Overview.md
@@ -4,5 +4,10 @@ At purchase the CM-MiniCNC was setup for 3 axis with CW-5045 Stepper Drivers and
 # CW-5045
 ![CW-5045](https://git.oit.cloud/morgan/5axxon-cnc/raw/branch/development/images/CW-5045.jpg)
 
+1. Power input type: 20VDC~50VDC
+2. Output current: 1.5A - 4.5A
+
+These driver are optically isolated and safe to use without further isolation **but(!)** the manual indicated signals are +5V.
+
 # Ball Screws
 TODO: measure ball screws
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