1) [Maximum support for safe driving] There is only one button, and since it is a type to be connected to the cradle, it can support safe driving to the utmost. By paired with a Bluetooth device in advance, it will be turned on automatically when disconnected from the charging cradle and can be answered immediately by pushing the call button so that the minimum operation can be done while driving, I will contribute. When you return to the cradle, it will be charged at the same time it turns off, so there is no need to worry about running out of the battery. In addition, since the clip is attached so that the cradle can be fixed to the fin of the air conditioner vent of the car, it is a headset that supports all Japanese drivers! • 2) 【High sound quality · Hands-free calling · Support for simultaneous pairing of two units】 We use the established chip of CSR company of the UK, realizing high sound quality with low delay. Of course, this headset also supports hands-free calling with a microphone. Because the microphone part is made slightly longer than usual, it is close to the mouth, so you can easily deliver a clear voice to the other party to pick up the sound easily. Also, as two cars can be paired at the same time, if you have two cars (eg Garakae and Sumaho, iPhone and Android etc), you can register both cars, which makes it very convenient. ) 【Package Contents · Corresponding Devices】 ● D4 Bluetooth Headset Body ● Dedicated Charger (Cradle) ● MicroUSB Cable for Carrying ● Carrying Case ● Ear Hook × 2 ● Ear Piece (3 sizes of S, M, L) ● Instruction Manual (Japanese) [Corresponding model] Corresponds to devices with Bluetooth (Bluetooth). Apple iPhoneX / iPhone 8 / iPhone 8 Plus / iPhone 7 / iPhone 7 Plus / iPhone SE / iPhone 6 s / iPhone 6 s Plus / iPhone 6 etc. iPhone models, iPad Pro / iPad Air / iPad mini etc iPad models, iPod models, Sony Xpeira, Google Nexus, Samsung Galaxy, Asus, Fujitsu, Huawei etc Android each model, Windows, Mac mounted PC etc.