Feature: √ 6 HOURS PLUS FROM ONE SINGLE CHARGE: Built in lithium rechargeable battery and USB lead to charge. CSR 4.0 bluetooth chip installed for lower power consumption to improve battery life. √ UPGRADE YOUR CONVENTIONAL TAPE PLAYER: Bring your cassette tape player into the 21st century and upgrade for wireless streaming. No more messy wires or cables - UPGRADE TODAY!! √ VERSION 4.0 +EDR BLUETOOTH CSR CHIP INSTALLED: This is the latest version for seamless pairing, longer range and lower power consumption. .