Boss

Chromatic Tuner for Guitar & Bass
This successor to the legendary TU-12 provides BOSS famous needle/LED indicators for fast, accurate tuning. Other features include Flat Tuning of up to six half steps, ACCU-PITCH with an audible beep, a reference tone, a built-in microphone for acoustic instruments and battery-saving Auto-Off.

Chromatic Tuner for Guitar & Bass
Tuning Range: E0 (20.6 Hz)- C8 (4,186.0 Hz)
Reference Pitch: A4 (438- 445 Hz)
Tuning Accuracy: 1 cent
Power Supply: Dry battery R03 (carbon) or LR03 (alkaline); (AAA) type x 2; DC 3 V, AC adaptor DC 9V (PSA series; optional)
Current Draw: 12 mA
Expected battery life under continuous use (carbon)
Approximately 15 hours
*This figure will vary depending on the actual conditions of use.

Accessories: Dry battery (R03 (AAA) type) x 2 (carbon), Owners Manual, Soft Case, Leaflet (USING THE UNIT SAFELY and IMPORTANT NOTES), Information

Size and Weight ( including batteries )
Width: 148 mm / 5-13/16 inches
Depth: 54 mm / 2-1/8 inches
Height: 24 mm / 1 inches
Weight: 0.1 kg / 0 lbs. 5 oz.