The alarm sound can be heard from another room. Extensively use in break time, cooking, beauty facial, gym, sport, medicine time, meeting, classroom... Etc. It’s also a good count up timer: Clear the time to "00:00", press / button and time will start to count up. Features - ColorAssorted Color - Material: Plastic. - Size: 7.5 x 6.5 - Power: 1 x AAA battery. (Not included) - Ring the sound of "BiBi" lasts for 30s when the timer is to , and you could press the / to it.. Loud & clear sound but not deafening. - The alarm sound can be heard from another room. - Great Quality : STRONG BACK, difficult to fall off, more than magnet. - LCD digital display allows easy read. - Made as ABS, difficult to break. - Small size and make it Pocket Portable. - Multi-functional: Extensively use in break time, cooking, beauty facial, gym, sport, medicine time, meeting, classroom... Etc. - It’s also a good count up timer: Clear the time to "00:00", press / button and time will start to count up. Package list: 4 x timer