SPST Black Push Off Mini Pushbutton Switch
Type : SPST Momentary 
Rating: 1A 125V ac / 0.5A 250V ac 
Contact resistance: 2.5V dc 1A 20mΩ or less 
Insulation resistance: 500V dc 100MΩ or more 
Voltage breakdown: 1000V ac 1minute 
Mounting hole diameter: 7mm