Specification: Item Type: Hunting Bird Caller Material: ABS Plastic Color: Green Weight: Approx. 2165g / 76.4oz Purpose: Amplify the Volume on the Car Power: 50W Signal To Noise Ratio: 200dB Applicable Models: 12V Car How to use: 1.||: To play/pause, press the play button once, and press the pause button again. 2.||: Short press to play the previous song, long press to quickly select a song, stop pressing your favorite song and play it. 3.||: Short press to play the next song, long press to quickly select a song, stop pressing your favorite song and play it. 4. SET: Timer button, press set to enter the timer setting. 5.VOL-: Short press to decrease the volume, long press to continuously decrease the volume. 6. VOL+: Short press to increase the volume by one level, long press to increase the volume continuously. 7. Loop button: change and contrast button of loop mode, short press to change single repeat and all play, long press to change contrast, then press voland volto to decrease or increase contrast value. 8.: Hotkey setting. Package List: 1 x Player 4x Speaker 1 x USB Charging Cable 1 x Manual