XH-M401 DC-DC Step Down Buck Converter Power Supply Module XL4016E1

Piezo electric Element buzzer 40mm (Vibration / Knock )  with Cable

Ultrasonic Mist Maker Humidifier, 5V Atomization Disc 108KHz Mist Atomizer DIY Humidifier with PCB, DIY Mist Atomizer Micro USB Board Ultrasonic Atomization Module for Home 

2 inch 6 Ohm 3W Full Range Audio Speaker Stereo Woofer Loudspeaker

IR Break Beam Sensor – 5mm leds 

This IR break beam sensor works by detecting an object breaking a beam of IR light. This particular sensor has a range of up to 50 cm / 20″ and can be used with 3.3 or 5V. 

A Grove sensor designed for indoor air quality testing.  

neodymium magnet 20 x 2 mm round

LM833N DIP-8 Amplifier Audio Integration Dual Operational Amplifiers

Disposable ECG EKG Electrodes Medical Electrode Patch EKG Accessories Diameter 50mm Electrode Pads    

e10 bulb 2.5v 0.3a with bulb holder

10uH Inductor 0810 i section shape Radial Leaded inductor

DC12V 0.43A 4mm Mini Electromagnetic Solenoid Lock Push Pull Type for Electirc Door Lock