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The ST 200 features both electronic stimulus and mechanical vibration paging modes. A mode selection switch conveniently located on the side of the handheld transmitter allows trainers to choose either the electric stimulus (S), mechanical vibration (P), or both (S+P) modes. The selected mode is activated by pushing the "nick" or constant (normal pulse) button, which also features the new sixty level intensity selection dial. 1 mile range.