The V4 is an entirely new design, offering improved functionality in a more streamlined package. We have even included a lanyard to hang it around your neck without holding it. Volume levels and sound quality have been dramatically increased, making iteasier than ever to hear in loud environments. Individual volume inputs can nowbe adjusted using glove-sized low-profile textured buttons on the front of thedevice. The V4 also incorporates a low-power backlit LCD screen that displays eachuser's volume and the device's battery status. Speaking of batteries, we’ve completely rethought how the Trac-Com V4 ispowered. For the first time, we’re incorporating a Dual Battery System with abuilt-in Li-Ion rechargeable battery and a compartment for a removable 9Vbattery. The lightweight internal battery can be used exclusively to power the V4,providing several hours of use and reducing operating costs. Don’t have time to charge it? Insert a 9V battery, and you’ll add hours of use andnever be without power again. If a 9V battery is installed in a fully charged(internal battery) Trac-Com V4, the device will favor the removable 9V, reservingthe internal battery for later use. Although the device is entirely new, we haven’t forgotten about our longtimeTrac-Com users. The Trac-Com V4 uses the same 5-pin headset connectorscustomers have relied on for years, making this new version fully backwardcompatible with previous headsets and adapter cables. Specifications: Dual Independent Volume Controls LCD Screen Dual Battery System Built-in 1500 mAh Li-Ion Battery - Rechargeable via USB-C Port Replaceable 9V Battery Locking headset connectors CE and RoHS-compliant Weight w/ 9V: 3.6oz Weight w/o 9V: 5.23 oz Size: L 4.4" W 2.66" H 1.20" Includes: Trac-Com V4, USB-A to USB-C Cable, Case, and Lanyard All Trac-Com intercom accessories can be found HERE *Canceled Pre Orders are subject to a 3.5% restocking fee