... Micro Earpiece (Secret Ear), is the cordless alternative to the standard wired earpiece. Secret Ear is cordless and virtually invisible to ... , Secret Ear is just as clear in sound as the standard wired earpiece, but with the added benefit of being more ... (not for Bluetooth solution) Standard Zinc-air battery: type 5 1,4 volt; type 10 - 1,4 volt or type 312 - 1,4 volt ...