Wmicro YE-106 Super Mini Wireless Bluetooth Earphone Ear-hook In-ear Headset with Mic Earbuds / Headset / Earphone Headphones for Hands Free Phone Call, Support Taking Phone Calls (Can not Listen Music) , Compatiable with Smartphone Tablet PC It features an ultra mini size, arguably the smallest earphone in the world. It adopts the latest intelligent DSP noise isolation and echo cancellation technology for perfect sound quality. The Bluetooth 3.0 technology allows you to connect two phones at the same time up to a range of 10 meters (without obstacles), so you will never miss an important call again. The ergonomically designed and discreet earplugs gives you full freedom whenever you wear it. It just requires a gentle gesture to activate, so you can always drive safely, as well as avoid interruptions during exercise or hiking. Wearing type: Ear Hook. Bluetooth version: V3.0+EDR. Power supply: Built-in 40mAh rechargeable lithium battery. Working voltage: 5V DC. Bluetooth distance: W/O obstacles 10m. Product size (L x W x H): 2.2 x 2.2 x 2.8 cm / 0.9 x 0.9 x 1.1 inches.