This is an Ikutsushi baby sensor. It detects when a baby is lying on their back, etc., and sounds an alarm. I purchased it around May of this year, and the main unit has only been used a few times. All accessories are included, and I will ship it in the original box. Operation has been confirmed. The outer box has been opened, so there is some minor damage. Basically, I am assessing this from a layman's perspective, so please understand this and read my profile before making a purchase! Below is a quote from the Rakuten official website ↓ Rakuten Ranking 1st Place 【Ikutsushi Official】Body Movement Sensor IMS-01 Medical Device izxi Ikutsushi Baby Sensor Alarm Infant Baby Breathing Body Movement Apnea Prevention Sleep SIDS Rolling Over Sensor Rolling Over Alert Type of medical device: General medical device Size: Length 55mm x Width 46mm x Thickness 23mm Main unit weight: Approximately 35g (including battery) Power supply: Lithium-ion polymer battery (3.7V, 450mAh) 【During use】Temperature / Humidity / Atmospheric pressure Temperature: +5℃～+40℃ Humidity: Below 90% (no condensation) Atmospheric pressure: 700hPa～1060hPa 【During storage】Temperature / Humidity / Atmospheric pressure Temperature: -40℃～+55℃ Humidity: Below 95% (no condensation) Atmospheric pressure: 500hPa～1060hPa Charging time: Approximately 2 hours Service life: 3 years Waterproof and dustproof performance: IP22 Materials: ABS resin, TPU (thermoplastic polyurethane), TPE (thermoplastic elastomer), polycarbonate Set contents ・Body movement sensor IMS-01 ・Instruction manual ・Attached documents ・Charging cable (USB type-C)