I've had problems getting the bluetooth (wireless) link to work with the 405, particularly with the Mac, and would recommend the 305.
San Francisco - 7/29/12
Warrior Dash Ohio II - 8/26/12
Chicago - 10/7/12
"Able to function despite imminent catastrophe"
"To obtain the air that angels breathe you must come to Tahoe"--Mark Twain
"The most common question from potential entrants is 'I do not know if I can do this' to which I usually answer, 'that's the whole point'.--Paul Charteris, Tarawera Ultramarathon RD.
√ Tahoe Rim Trail 100M 19/20 July 2014
Georgia Death Race 14 March 2015
Boston Marathon 20 April 2015
Lower Potomac River Marathon - March 8