An alarm will sound if no movement is detected for approximately 20 seconds. This alarm is designed to prepare for emergencies during sleep. - Brand: BabySmile - Model: E-202 - Function: Baby movement sensor - Target age: 0 months and up - Included items: Instruction manual Opened, but only used once. The baby quickly started rolling over, so it hasn't been used since. As of December 28, 2025, this product is available on Amazon for 5380 yen (tax included). Please feel free to consult if you require a price reduction. Thank you.