Product Description of HX103: I. Product Functions: 100-minute electronic forward and backward timer/with memory function. Ii. Application Scope: Lunch break, study time, beauty time, exercise time, call time, meeting time, kitchen cooking, parking time, for experiments, etc. Iii. Forward Timer Settings: 1 Press the START/STOP (ST/SP) key to start the countdown. Press any key to stop the countdown. Press "MN (M)" and "SEC (S)" to reset to zero. 4. Countdown setting: Press "MN (N)" to set the time (minutes), and press "SEC (S)" to set it (seconds). 2 Press the "START/STP (ST/SP)" key to start the countdown. 3: A 60-second buzzer will sound when the time is up. 4: Press any key to stop the countdown, and simultaneously press "MN (M)" or "SEC (S)" to reset. 5: The function of the memory function. 1 When no key is pressed after the countdown ends, the buzzer's prompt sound stops and the countdown setting value is displayed on the screen. 2: Press the "START/STP (ST/SP)" key again to start the countdown. 6: Battery replacement 1: Replace the battery when the timer is unclear or the sound weakens. 2: Use AAA7 batteries. 3: Slide open the battery cover, take out the battery, distinguish the positive and negative terminals of the new battery and put them in, then push the battery cover back to its original position. Product Specification :1 piece /200PCS Net Weight per piece: 69g Gross Weight per piece: 0.078kg Size per piece: 82.5*76*23mm Packaging Specification: 62.5*30*48.5cm Net Weight/Gross Weight: 16.4kg/19kg Display Screen Size: 64.5*33.5mm Packaging quantity 200PCS