Features 1、This product includes four independent bandpass filters, which are divided into four frequency bands. 2、P1 filter is 0.5-1.5MHz, suitable for MediumWave radio listening use. 3、The P2 filter is 4.5-12MHz, suitable for use in the ShortWave low frequency band and the 40 meter amateur frequency band. 4、The P3 filter is 12-30MHz, suitable for use in the shortwave high-frequency band, as well as in the amateur frequency bands of 20 meters, 15 meters, and 10 meters. 5、The P4 filter is for FM broadcasting frequency, 88-108MHz. Specification The four in one filter can be used with a one to four source splitter, providing pre filter function for SDR, radio, and receiver, implement multi-channel and multi-band simultaneous reception. Features: This product includes four independent bandpass filters, which are divided into four frequency bands. P1 filter is 0.5-1.5MHz, suitable for MediumWave radio listening use. The P2 filter is 4.5-12MHz, suitable for use in the ShortWave low frequency band and the 40 meter amateur frequency band. The P3 filter is 12-30MHz, suitable for use in the shortwave high-frequency band, as well as in the amateur frequency bands of 20 meters, 15 meters, and 10 meters. The P4 filter is for FM broadcasting frequency, 88-108MHz. Specifications: Color: black Material: metal Item size: 49 * 45 * 19mm / 1.9 * 1.8 * 0.8in Item weight: 55g / 1.9ounce Package size: 75 * 72 * 30mm / 3.0 * 2.8 * 1.2in Package weight: 65g / 2.3ounce Packing List: 1 * Filter Package List Packing List: 1 * Filter