The Tandem Pro 2 unit is designed to work for student/instructor race car training applications. The unit works as a full duplex intercom, which allows a race car instructor to guide a student while in the same car. The student headset is designed to easily slide in/out of one students helmet to another and the instructor headset is self installed for a more permanent installation. The Lithium Ion rechargeable battery life is rated at 8-10 hours of talk time and 20 hours of standby. (Headsets are sold separately) OVERVIEW: FEATURES Student-Instructor full duplex intercom system Two way in helmet communication between Studen and Instructor Noise reducing Hi Fidelity headsets (full or open face style) Lithium Polymer rechargeable batter w/ 10 hours talk time 20 hours standby No custom installation necessary COMMUNICATION Intended Users: Race car training instructor Maximum range of communication: Wired Maximum number of users in communication: 2 GENERAL FEATURES Battery: Rechargable Ni-Mh Water resistance casing PACKAGE CONTENTS: Tandem Pro 2 Unit Only USB Charger Battery Mounting Bracket Manual ACCESSORIES: Universal Headset: CBDUOUHS (29.99) Student Racing Headset (can be used for full face helmet): CBTP2SRHS (34.99) Open face microphone only: CBDUOUHSMIC (8.95) 6 pin to 3.5mm headset adapter (Use for previous CB50 unit with new headsets, either CBDUOUHS or CBTP2SRHS) :CBTP26PIN (5.99) Headset Extension cord (for Passenger): CBHSEX (14.95) USB Charger: CBDUOCHRG (14.99) Mounting bracket: CBDUOMB (9.99) MANUAL: CLICK HERE