Timer, waterproof, 100 minutes by min/sec, 2"W x 7/8"H (5.1 x 2.2 cm) display, counts up/down, shatterproof, big digit, loud & long audio/visual alarm, stop & restart, last count recall, counts up after zero, on/off button, requires (2) AAA batteries (included), 2-way mounting: magnet/stand, ABS plastic