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interested in purchasing Tens Unit (Trans. Electronic nerve stimulators)Channels: Dual, isolated between channels.Pulse Amplitude: 0 to 80 mA each channel, adjustable (500 ohm load)Pulse Rate Frequency: 2 to 150 Hz, adjustable.Pulse Width Duration: 60 to 250 microseconds, adjustable.Wave Form: Modified square wave with zero net direct current DC component.Maximum Charge: 20 micro coulombs per pulse.Power Source: 9 volt alkaline battery.Battery Life: 70 hours average usage (alkaline)Size: 24 x 64 x 95 mm Weight: 130 grams (including battery) tens unit, nebulizers medical products, tens unit, nebulizers, wheelchairs, hospital beds, wheelchair cushions, walkers, commodes