Cheap And Discounts 2PCS 400K Crystal Oscillator Throught Hole Active Crystal 400.000KHz OSC DIP-4 Rectangular Clock Vibration Full Size 4Pin 400KHZ Wholesale. Buy Directly From Merchant Electro Components Store. Enjoy ✓Free Shipping Worldwide! ✓90 Days Buyer Protection. ✓Easy Return. ✓Money Back Guarantee.