Walker's Razor XV 3.0 Bluetooth Headset Electronic Earplugs - The Razor XV 3.0 is a non-intrusive neck worn design with flat, no-tangle cables. Bluetooth version (GWP-BTN-BT) includes: A free control app that allows for complete control of your Razor XV 3.0 from your SmartPhone using the Walkers LINK app - Found in Google play and App Store. Retractable Digital Ear Buds Bluetooth Connectivity - Controlled By Walkers Link App Found In Google Play And App Store Rechargeable Lithium Battery Hi-gain Omnidirectional Microphones For Clear Sound Enhancement Earbuds In Improved Position For Less Cord Interference Hd Walker's In Earbuds For Wide Range Audio Quality 3 Pairs Of Foam Tips - (S / M / L) Included Integrated Micro Usb Port Micro Usb Charging Cable Included 4 Frequency Modes: Universal, Speech Clarity. Hi-frequency And Power Boost Independent Volume Control