OMRON

Ultra-small Tactile Switch (SMT) B3U Ultra-small Surface-mounting Tactile Switches with High Contact Reliability (1.2 × 3 × 2.5 mm (H × W × D) 
• Smallest class in the industry for high-density mounting of compact devices. 
• Surface mounted: Ideal for high-density mounting. 
• Models with ground terminals are available for protection against static electricity. 
• SPST-NO 0.05A 12V