2018-06-26 Active Noise Cancelling Headphones,Tronsmart Bluetooth Earphones Earbuds Wireless Lightweight Neckband Headset with 20 Hours Playtime and Built-in Microphone(Noise Reduction) for iPhone 8/8 Plus/X 道具 https://www.amazon.com/Cancelling-Headphones-Tronsmart-Lightweight-Microphone/dp/B0711T1GMD/ 30ドルくらいか。