The Kicho is a highly sensitive, compact sound amplifier. It allows you to hear even small sounds clearly, making conversations much easier. By selecting frequencies, you can filter out background noise and hear the sounds you want. The left and right volume balance can be adjusted, which is convenient for those with different hearing abilities in each ear. The sound-collecting microphone faces outward, so there's no unpleasant rustling noise even when it's in your pocket. Operation confirmed, both left and right sides are audible. Used a few times. - Model: KR-77 - Accessories: Instruction manual. Batteries not included (AAA, 1) - Manufacturer: Annex Co., Ltd. - Size: Length 115mm x Width 28mm x Thickness 15.5mm - Weight: Approximately 30g - Audible frequency selection function: <Audible Frequency> Hi: 200Hz - 14,000Hz, Low: 200Hz - 4,000Hz - Left/right volume balance adjustment <Sound Pressure Level> 120dB - Earphone impedance: 32Ω - Continuous operating time: Approximately 90 hours The elbow and knee supports use germanium power and the support itself to gently protect and soften various joints such as wrists and ankles, and their excellent heat retention warms and improves blood circulation. The material is 100% silk, so it won't dry out your skin. The elbow and knee supports have been stored in a drawer for a long time and are included as a bonus. Based on my experience with the device, I could clearly hear sounds louder. Also, I didn't notice any noise. (This is just my personal opinion.) It will be shipped in its original box, placed in a kitchen plastic bag, and packaged using recycled materials via Yu-Packet Post. If you prefer delivery by courier service, please contact me. Thank you for your understanding and purchase. Thank you for viewing.