Maxer Counter with sensor chime MCR-SC Switch can be switched in three stages of counter + chime OFF only counter. Three power use AA batteries ~ (sold separately) Counter & chime when using (in the case was operated 10 times a day) the battery life / use when only about six months counter / about 9 months  new using alkaline batteries Product Size W87 ~ H72 ~ D28 (mm) Product Weight 70g