Shop BEK Medical today and view our selection of EMS equipment including our Twin Stim Tens and EMS Combo. The EMS comes with two modes; synchronous and alternate. It also includes device, lead wires and four self-adhesive reusable electrodes. The patient compliance meter can store up to 60 sets of operations manual and includes a power source of a 9 volt battery. The contraction time is 2-90 seconds with a relaxation time of 2-90 seconds. Call us with any questions!