Polar m400 with hrmfor urban and trail runners who want sporty design with advanced gps and training features along with loads of options to keep an eye on their activity features backlight battery life up to 8 h training time when both gps and hr in use 24 days in time mode with daily activity monitoring rechargeable battery with standard micro usb cable firmware update date and weekday indicator button lock time of day 1224h with alarm and snooze water resistant 30m body measurement