4pcs Boost Transformer Please allow 4-6 days processing before ship out. For gearmotors or similar motors, we don’t ship using epacket and will use regular shipping if needed. Please note that regular shipping like singapore post might take 45-60 days to deliver, epacket 20 -35 days to deliver Thank you for understanding. » Electronic Components » 4pcs Boost Transformer This is an ultrasonic frequency boost transformer for ultrasonic sensors transducers. SKU: CQY10026064231 Price: 1.40 $ Product in stock SSL Certificate Quantity Updating cart... This is an ultrasonic frequency boost transformer for ultrasonic sensors transducers. Specifications Frequency: 40 KHz Inductance: 8 mH ± 5% Related Products 10pcs L7812 12V Voltage Regulator TO-220 GPIO Adapter for Raspberry Pi v3 Model B (T shape) 5 A PWM Driver Module SK10 Linear Axis Holder Black Case for Rasbperry Pi 2 Model B+