Self-Discipline Phone Timer Lock Box Can Receive Phone Calls, Color: Blue Without Backlight

1. Button A: light up screen, set time, emergency unlock, study room mode, hesitation period to cancel set time2. Button B: opens the self-study box, cancels the set time during the hesitation period3. Battery life: 60 days on a single charge under normal usage intensity (frequent use of side button B is not recommended)4. Battery capacity: 300mAh5. Comfortable grip and easy to carry around6. 2 and only 2 long presses for 10 seconds for emergency activation7. 3 consecutive presses to switch to silent mode, no disturbance to others in public areas8. 5 minutes - 12 hours autonomous timer9. Internal diameter: 166x85.5x14mm10. Dimensions: 205x95x20mm11. Weight: 163g