Srt-2 black q link pendant,Clarus Transphase Scientific, Inc. - Q-Link and other wellness products featuring Sympathetic Resonance Technology (SRT-2) - Development. 

Classic Black SRT-2 Q-Link Pendant 

Simply worn and combining ease of use and utility, the Classic Q-Link is the most affordable pendant. SRT-2 supports your general well-being and is ideal for users in less stressful, non-performance oriented environments. Classic SRT-2 Pendant also can be in your pocket. Easy to use, durable, lightweight, waterproof and versatile.  Circuit board design on Classic SRT-2 pendant for aesthetics 

Casing: Durable, Waterproof Injection Molded Plastic

Approximate Weight: 7g

W: 36mm X H:37mm X D:3mm

(Approximately 1.5" W X 1.5" H)

If you have any questions about this item let me know thanks sold as is.