Features: 3 major modes: Independent timing: two groups of timing forward/backward, each group can be timed up to 9 hours, 59 minutes and 59 seconds Two independent cycle countdown timing: automatic cycle up to 99 times, with count display Two alternate cycle countdowns: alternate cycle up to 99 times, with count display 3 storage memory function: each group has three independent memory time, different modes can also be customised memory time Mute/shutdown function: short press loud, soft, mute have flashing light prompts, long press can shut down; fully applicable to fitness, learning, cooking and other scenes. Specification: Name: Dual Groups Recyclable Timer Volume: Loud/Lowith Mute Material: ABS Mirror: Acrylic mirror Power supply: 2 AAA batteries (batteries not included) Net weight: 150g Size: 93 x 73 x 21mm Color: Gray Material: ABS Function: Independent positive/reverse countdown, independent cycle countdown, alternate cycle countdown,3 storage memories Package Contents: 2 x Kitchen timer Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.