(1) Positive timer/countdown function, the timing range is 99 minutes and 59 seconds, there be a status bar at the bottom of the screen when the countdown is started, and it be reduced by percentage (2) Custom mode (3) Child lock function (4) 4 Ringtone Choices (BIBI Sound & 3 Music) (5) Three levels of brightness (low-medium-high), four levels of volume (mute-low-medium-high) (6) Battery low power reminder (7) Various ways of placement: magnetic/lanyard/hanging hole/bracket (8) Power supply mode: 3*AAA battery (Not Including) Colour:black Material:plastic Package Contents: 1 * Visual timer 1 * cable 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.