The ASSURA GR-81 is a compact GPS receiver that connects to a cigarette lighter socket and features volume adjustment. The GPS data is the final version, December 2021. As a bonus, the memory card includes the final GPS data version, firmware 3.00, and the instruction manual PDF. Please refer to the Cellstar Industry page for details: https://www.cellstar.co.jp/products/gpsreciever/gr/gr-81.html Although it's an older model, it's simple and should be sufficient as an auxiliary tool for safety. - Model: GR-81 - Brand: ASSURA - Function: GPS receiver - Volume Adjustment: + VOL button - Power: Cigarette lighter socket connection - Condition: Used - Design: Compact design Thank you for viewing.