This sensor is quite small and use a tiny connector called the Japan Solderless Terminal (JST) connector.
The Grove - Alcohol Sensor implements all the necessary circuitry for MQ303A like power conditioning and heater power supply. This sensor outputs a voltage inversely proportional to the alcohol concentration in air.
The Grove – Light Sensor module uses GL5528 photoresistor(light dependent resistor) to detect the intensity of light in the environment.
The Grove - Barometer (High-Accuracy) it can be used on Arduino/Seeeduino or Seeeduino Stalker without modification.It is designed to be connected directly to a micro-controller via the I2C bus.