KWANWA Cordless Digital Wall Clock Battery Operated Only with Large 1.4'' Red LED Number Display,Can Be Placed Anywhere Without A Cumbersome Cord Easy to Operated -- Both need 2 steps for Clock setting and alarm setting,12H/24H can be switched Digital Electronic LED Wall Clock -- There are 3 holes on the back of the wall clock for you to hang on the wall stably,Also you can stand it on the book shelves,nightstand,office desk Battery Powered only -- Kawanwa digital alarm clock just need 2pc d size lr20 alkaline battery you can use at least for 1 year 3 levels of Adjustable Brightness -- High brightness with 3 intensity levels to accommodate different needs.The clock will dim and be on night-mode automatically during 8:00pm--6:00am Premium Warranty -- Kwanwa portable alarm clocks are backed by a 90-day satisfaction guarantee and a 1-year warranty for true quality assurance.