The slave side of the ANT connection needs to establish a link with the master. In order to do this effectively on a coin cell battery the receive radio is turned on and off by ANT. This patented search algorithm uses about a 10% duty cycle, meaning that the radio is actually off for over 90% of the time. Since there is no master clock in an ANT network a slave has no idea of when a master will transmit, so the search algorithm varies the receive window spacing and usually connects within four message periods. Since the radio is used much more in search mode, to save battery capacity care must be taken in turning the search off when no master has been found. An ANT search takes an average power of about 3mA vs. average powers of less than 25µA for a synchronized ANT message.