Here's a breakdown of the given specifications:

• 10 Watt: This indicates the maximum power the attenuator can handle without being damaged.
• 0-40dB Step Variable: This means the attenuation can be adjusted in steps from 0 to 40 decibels. A higher dB value means a greater signal reduction.
• 10W 3dB: This might refer to a specific setting on the attenuator where it reduces the signal by 3 decibels while still handling a maximum power of 10 watts.
• 3GHz: This is the maximum frequency the attenuator can operate at.

10W 1,2,3,5,6,10, 20,30dB RF Coaxial Attenuator Fixed Coaxial termination 50 Ohm with SMA male/female

 

Specification
Model	ET-40D3G10WAT-NMS-NFS
Power	10W
Connector	SMA-JK
Frequency Range	DC-3GHZ/6GHZ
Attenuation	1,2,3,5,6,10,15,20,30dB available, and 1-10dB.±0.5dB,15-30dB±1dB
VSWR (MAX)	1.2:1
Impendance	50Ω
Temperature Range	-55°C to +125°C
Dimension	Φ30*59mm
Weight	64g