Features: Support 9.9Khz-181mhz frequency receiving, receiving directional, can rotate the Antennae to find the best receiving angle. With signal amplification circuit, gaining 10--30dBuV. Suitable for Malachite receiver, TEF6686 receiver, radio connection TYPE C charging connection, 5V1A charging (fast charging is prohibited), the endurances time is around 35 hours . The amplifier circuit can be switched offing, you can use originally BB Antennae Antennae only. Easy to install and operate: Our round Antennae design is easy to install and simple to operate, ensuring that users can start using it quickly and without any hassle. Specifications: Item：BB Antennae Support 9.9Khz-181mhz frequency Gaining 10--30dBuV Charging connection: 5V1A Type C Size:about 110x110x3mm/4.33x4.33x0.12in Weight：60g Battery: 250mah Package Includes: 1PC 9.9Khz-181mhz BB Antennae note: Due to problem of lighting effect there might be tolerances in product, please understand. Please allow 0-2mm error due to manual measurement.