1. USB interface powered low noise amplifier, convenient power interface, moderate gain, high IP3, low noise. 2. Powered by USB type-C interface, built-in high PSRR can effectively reduce power supply noise, and effectively reduce background noise compared with other merchants' USB direct feed modules. 3. Adopting a very compact design, using a system shielding cover, it may rust when exposed to a humid environment. Please pay attention to moisture protection when using outdoors. 4. Launched USB interface powered low noise amplifier with built-in battery. 5. Reduce power consumption, suitable for portable use, more flat and consistent gain, lower background noise, smaller size, and longer battery life. DIY consumables:electrical Due to different batches, the appearance and printed text of the product , which not affect the use. Type:ZK09-BM Colour:Black Material:Plastic+Metal Package Contents: 2 x Low Noise Amplifier 2 x USB Cable Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.