Manufacturer Gedsffati Oxygen Meter & Carbon Monoxide Meter

Purchased from Amazon in February of this year for my pet, but only used a few times.
Original price was ￥14,999.

I would be grateful if someone could use it.

It has been stored at home.
Accessories and the box are also included in the 10th photo.

Photos 1-3 are from Amazon, and the following is the description from Amazon:

Manufacturer: Gedsffati

[UK Sensor & 6-in-1] The DDS oxygen sensor in this product is imported from the UK, ensuring product accuracy and stability. It can simultaneously measure carbon monoxide, oxygen, atmospheric pressure, altitude, humidity, and temperature. You can immediately understand the real-time gas levels in your surroundings by looking at the measured values. It is small and easy to carry. It can be used while charging.
[Power Saving Mode & Manual Calibration] Size: Length 7.1cm x Width 7.1cm x Height 3.2cm. Weight: 220g. This product adopts low power consumption. If there is no operation within 1 minute, the device will automatically enter power saving mode, significantly extending usage time. The product continues to operate in power saving mode. This product has a manual calibration function by pressing and holding the power button and M button simultaneously.
[Rechargeable & Measurement Range] Equipped with a new 1500mAh battery with Type-C power supply (included). Charging time: approx. 3 hours. Can be used for approx. 60 hours on a single charge. Refresh rate: approx. 2 seconds. O2 measurement range: 0-30%vol, CO measurement range: 0-500ppm, Altitude measurement range: -500-9000m, Atmospheric pressure measurement range: 300-1100hpa, Humidity measurement range: approx. 0%-95%RH, Temperature measurement range: approx. -20℃ to 61℃. Can be used in various locations.
[Alarm Value & Warning Display Color] CO concentration alarm value: 51-500ppm. The indicator light color changes based on the carbon monoxide concentration data. A constant green light means the environment is normal. When at a warning level, the yellow light will flash (and an alarm will sound). When at a danger level, the red light will flash (and an alarm will sound). The alarm can be turned on/off, allowing you to monitor the CO gas concentration in your surroundings at any time.
[Applicable Scope & Quality Assurance] Suitable for rooms, pets, oxygen rooms, and even outdoors. It can be used as a tabletop device. It is also very useful as a handheld air pollution monitor.