Description: - (SR) are a set of peaks in the extremely low (ELF) part of 's electronmagnetic field specturm. - This waves with high stability, give better using experience. - You cable, no included, which is convenient . - use , also can use to improve work efficiency. It has a wide ranges of uses. - operate, directly after plug in , whether a novice amateur, quickly.Specification: - Material: - Power supplys: port - Resonant : 7.8 (adjustable)Size Chart:82X100mm/3.23X3.94inchPackage Includes:1 Piece WavesNote:1. Please allow slightly error due to manual measurement.2. Due to between different monitors, the picture may not reflect the actual the item.3 shopping!