Metal Switch 16mm Stainless Steel

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

This switch can be used for development projects and for the industry. All metal parts are not oxidized, the insulation material is of high quality.
Its pins protected by an anti oxidant makes welding much easier. Switch On/On 6-pin 6A SPDT features:
- Type: Latch SPDT
- Material: Plastic, metal
- Maximum operating current and voltage: 3A / 250V, 6A / 125V
- Number of pins: 6
- Pin size: 4.5x2 mm
- Type of current: AC
- Pins to be welded
- Switch action: 2 positions On/On
- Size: 13.2x12.7x33.3mm

10x Male-Male Cables 20cm Jumpers Dupont 2,54 features:
-Length: 20cm
-Quantity: 10 cables
-Connectors have male header contacts at either end
-Compatible with female connectors 2,54mm
-High quality and good working conditions
-Easy to install and use

LED Diode Assortment Kit 50x Red Green Yellow Blue White features:
  
- Lens color: Red, green, yellow, blue - diffuse, light white
- Size: 5 mm
- Operating current: 20mA
- Voltage (red) 1.8V-2.3V
- Voltage (green) 3.2V-3.4V
- Voltage (yellow) 1.8V-2.3V
- Voltage (blue) 3.0V-3.2V
- Voltage (white) 3.2V - 3.4V
- Anode (A): Positive (long leg): 17mm
- Cathode (K): Negative (shorter leg): 15 mm
- Operating temperature: -25ºC / 80ºC
- Welding temperature: + 260ºC
- Quantity: - 50 units
                  - 10x red
                  - 10x green
                  - 10x yellow
                  - 10x blue
                  - 10x white

10x Photoresistor 5mm GL5516 LDR 5-10k for Arduino.
Photoresistor is a resistor whose resistance decreases when increasing the intensity of the light that falls on it. 10x Photoresistor GL5516 LDR features:
- Model: GL5516
- Spectral peak: 540nm
- Maximum DC voltage: 150V
- Maximum power: 90mW.
- Resistance with light (10lux): 5-10KΩ
- Resistance with darkness (0lux): 0.5MΩ
- Response time: 20ms
- Operating temperature: -30ºC - 70ºC

It is compatible with almost any microcontroller, Arduino, PIC, AVR.
It can be used in Access Control projects and Alarm projects. RFID Module with Card and Pendant features:
- Supports Quick CRYPTO1 and MIFARE
- Operating current: 13-26mA at 3.3V
- Standby current: 10-13mA to 3.3V
- Sleep-mode current: <80μA
- Maximum current: 30mA
- Frequency of operation: 13.56Mhz
- Reading distance: 0 to 60mm
- Communication protocol: SPI
- Maximum SPI speed: 10Mbit / s
- Maximum data rate: 10Mbit / s
- Operating temperature: -20 to 80ºC
- Humidity of operation: 5% -95%

2x Banana Connector Diameter 4mm Red and Black features:
- Length: 40 mm
- Diameter plug: 4mm
- Quantity: 2 units

Shield Ethernet for Arduino boards and compatible based on the Wiznet W5100 chip.
Provides an easy way to connect your module to the local network now internet.
Compatible with the official Arduino Ethernet library.
With this shield you can build a web server.
It can be used as a server or as a client.
It has support for a microSD that can be used to store files for distribution on the network. Ethernet Shield W5100 Web Server features:
- Controller: Wiznet W5100
- Supports protocols TCP and UDP
- Supports up to 4 simultaneous connections
- Compatible with all Arduino versions: UNO, mega 1280/2560
- Dimensions: 74 x 54 x 25mm