The EM-Drive is one of the best regarded transparent drives going around. This is the brand new version, and it does exactly what it sets out to do. There's not a heap of gain on tap, but as a clean boost or a light, transparent drive, this absolutely excels. Perfect as an 'always on' gain enhancer or a boost for lead parts.

Model: Emerson EM-Drive Mach 2
Made in: Bixby OK, USA, recent model
Type: low gain boost/overdrive
Power: standard 9v supply or battery
Equivalent new street price (approx): $275aud
Mods: none
Accessories: original box and manual
Condition notes: used, no major marks, excellent condition