It's a 16 MHz Crystal oscillator. A crystal oscillator is an electric oscillator-type circuit that uses a piezoelectric resonator, a crystal, as its frequency-determining element. Crystal is the common term used in electronics for the frequency-determining component, a wafer of quartz crystal or ceramic with electrodes connected to it. They are used in monochrome TV transmitters to generate the required picture frequency. 

Package Includes :

1 x 16 MHz Crystal oscillators

Specifications :

• Product - Crystal Oscillator 
• Frequency Range - 16Mhz
• Tolerance (%) - 30
• Operating Temperature Range -  -10 To +60C
• Length (mm) - 10
• Width (mm) - 4.4
• Height (mm) - 3.3
• Weight (g) - 1