Mini plastic box

High sensitivity to Ammonia (NH3), Nitrogen oxides (NOx), Alcohol, Sulphides, Benzene (C6H6), CO2, smoke and other harmful gases.  The MQ-135 sensor is to sensible for other gasses in the air so that is not possible to get good values for CO2 from it.
MQ-135 Air Quality Sensor features:
- Main chip: MQ-135 natural gas sensor and comparator LM393
- Working voltage: 5V
- Current: 150mA
- Digital output: TTL 0/1
- Analog output: analog voltage sensing value
- Quick response features:
- Detection concentration:
   10ppm - 300ppm NH3
   10ppm - 1000ppm Benzene
   10ppm - 300ppm Alcohol
- Adjustable sensitivity with the potentiometer
- Size: 32mm x 20mmx 18mm

4 RGB LED panel with digital control to be connected in cascade to complete the reception and decoding of the data.
The light emitted is very powerful and millions of colors can be generated thanks to the RGB device. 40 LED RGB Digital Panel Adafruit Neopixel with Connectors 5050 Matrix features:
- 40 individually addressable RGB LEDs (NeoPixels based on SK6812 or WS2812B) arranged in a 5 × 8 matrix
- 24-bit color control (8-bit PWM per channel); 16.8 million colors per pixel
- The digital control interface of a single cable requires only one Arduino pin (the default pin can be customized)
- Operating voltage range: 4 V to 6 V (connected to the 5 V Arduino rail by default)

The 8in1 Pen Screwdriver is a practical set containing 8 straight and Phillips screwdrivers for screwing and unscrewing various screws. The screwdriver is equipped with a detachable tip in which all the bits are stored.

Led module infrared sensor for Arduino
Detector of the source of fire or flame, can detect a flame or wavelength 760 nm-1100 nm
Particularly sensitive to the flame spectrum.
This optical flame sensor is a device that detects the existence of combustion by the light emitted by it.
Infrared LED Flame Sensor 5mm module features:
- 4 Pins Output:
    - A0: analog output
    - D0: digital output
    - GND: ground connection
    - VCC: 5V module power
- Range of light, Distance of 80 cm.
- Angle detection of about 60 degrees,
- This light can be detected by an optical sensor,
- Can be captured by digital inputs and analog inputs of Arduino.

The sensor measures the current flowing in the cable without cutting it. The measurement is made on a single insulated wire, the output is an analog voltage from 0 to 1 V. Sensor SCT-013-030, Non-Invasive 30A AC Current Meter features:
Input current: 0 to 30A AC Output voltage: 0 to 1 V AC Built-in load resistance: 62 Ω Winding ratio: 1800: 1 Operating temperature range: -25 ° C to 70 ° C Cable length: 1 m Sensor weight: approximately 45 g Sensor SCT013-030 datasheet

Precision screwdriver set made of extra hard material with comfortable aluminium handle. Contains 24 bits and is supplied in a practical case.

This Reed switch module uses a small device called a reed switch.
When the device is exposed to a magnetic field, the two ferrous materials inside the switch come together and the switch closes. When the magnetic field is removed the switch opens. The operating mode: - When exposed to a magnetic field the DO output is high
- Power supply: 3.3-5V
- Contact type: SPST-NO (normally open)
- Use temperature: -20ºC to + 80ºC
- Type Output: Digital (1 - 0)
- PCB dimensions: 32 x 14 mm

40x Cables Female-Male 20cm features:
-Length: 20cm
-Quantity: 40 cables
-Connectors have male and female header contacts at either end
-Compatible with female connectors 2,54mm
-High quality and good working conditions
-Easy to install and use