CVK918 Earpiece - New style non-magnetic earpiece , size is smaller than 218 earpiece Super MINI AMK 918 Earpiece Covert Earpiece available Non-magneitc Purple Description: Mini wireless earpiece is a micro-mini wireless inductive receiver which transforms audio signal through electromagnetic induction. These products make the covert communication possible when it is inconvenient to expose earpieces. earpiece is widely used in many departments .Using this device;You can hear the voice from the person other side,and the person of the other side can also hear your vioce. Hotspots:Small, light, easy to conceal.Comfortable for wearing with an optimum anatomic designWork principle: Mini wireless earpiece is a one-way reception equipment driven by electromagnetic induction and is used in conjunction with drive equipments, such as radio and mobile phone Technical specification: Mini wireless earpiece receives signal by inductive coil. across electromagnetic fields Receiving distance: 50-70 cm Standard Zinc-air battery: type 337 Battery life: about 5-8 hours Audio bandwidth: from 300 Hz to 4 KHz Distortion: