Truth Seeker Productions/GearTechs.com

The THOR Hammer SE (single ear) headset microphone is a high performance microphone that features a Danish omnidirectional condenser capsule. Carefully tuned for clear, articulation of both male and female voices, these headset microphones are perfect for houses of worship, presenters, theater and broadcast. The mic system features a lightweight, flexible boom, an optional, included wrap-around headband for dual-ear security, and a detachable, easy-to-replace cable.

Features
• Omnidirectional capsule
• Incredibly lightweight
• Single-ear design with dual-ear adapter included
• Compatible with most manufacturer’s products
• Includes protective case
• Available Colors: Tan, Black, or Brown
• Available Connectors: TA4F, 3.5mm, Hirose 4-pin, XLR3, MIPRO

Hammer SE-9 features a 90mm (3.5 in.) boom
Hammer SE-11 features a 115mm (4.5 in.) boom

With slightly different retail packaging, the Thor HSO11 microphone was also known as the Thor HM-SEO11-T-TA4F-1 (for Shure), HM-SEO11-T-TA4F-2 (for Shure), HM-SEO11-T-3.5-1 (for Sennheiser), HM-SEO11-T-HI4-1 (for Audio-Technica 2000), HM-SEO11-T-XLR3-1 (for AKG and Audix). 

Differences in color are denoted T - Tan, BR - Brown, BLK - Black. 

These are all identical with respect to audio performance and in a physical sense.  Just a different carrying case.