Vanlong Technology Co.,Ltd., (VTC), offers popular Frequency Control and RF products manufactured by well known China manufactures. We have serviced overseas customers successfully since 1994. We welcome your inquiries. T......Vanlong Technology Co.,Ltd., (VTC), offers popular Frequency Control and RF products manufactured by well known China manufactures. We have serviced overseas customers successfully since 1994. We welcome your inquiries. Through VTC, you will be informed of well rounded product offerings such as leading edge Chinese Frequency Control and RF products. These offerings include Quartz Crystals, Oscillators, Saw Resonators and Filters along with a wide variety of related Ceramic products. We are committed to high quality and respectful service .