Omron Micro Switch, SPST, 1 mA @ 30 V dc

One of the worlds smallest detection switches (3.0x3.4x0.9mm, WxDxH)
A unique mechanism enables high contact reliability and high precision operation
Supplied in strips of 25, on embossed taping
Ideal switching solution where small size and low weight are key requirements in an application
Weight approx 0.02g