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The Campagnolo EPS V4 Power Unit gives power to all movements of the 12-speed EPS groupsets. The unit is easily fitted in two different ways, there is a choice of seatpost mount or down tube/seat tube mount (sold separately). The Power Units slender shape makes it compatible with virtually all seat posts on the market. Industry leading battery life is further extended with a 10% increase in charge capacity, rendering the need to recharge very infrequent.