Digital Bionic Ear MonocularsDigital Bionic Ear for Long Range Listening, Ideal for Bird Watching and Nature Product Description Select the range, then pull the trigger to hear the amplified sound. No need to installsim card and sd card, you can record 12 seconds of sound. Clear magnification, audible bird sounds. 8x prism optical system. Using a foldable rubber eye mask, rolling up the mask can expand the field of view. High definition imaging. BAKE4 optical glass has FMC green