GARMIN EDGE 520J. The power button has deteriorated and broken due to years of use, so an eraser has been cut to the shape of the button to cover the hole. Because it has a silicone cover, there is no problem operating the eraser power button, and the appearance is not particularly noticeable. The battery life is poor, with a charging alert appearing after about 2 hours. There are no problems with the electronic system, and it syncs with various sensors. - Brand: GARMIN - Number of buttons: 7 - Back design: Mount attachment part available Thank you for viewing.