The experts at E-Stim Systems offer the 2B PRO PACK:
According to the E-Stim Systems website,
“We have taken our highly popular digital electrostim power box the 2B, and added a set of advanced accessories, designed with the experienced or advanced user in mind.”
2b Pro Pack information here.
Bonus for Metalbond readers: Use code “METALBOND” at checkout to save 10 percent on your order