Features:

• No buttons! Simply flip the tuner up to power it on, and push it down to turn it off. 
• 3-color backlit LCD display: yellow for flat, green for in tune, and red for sharp.
• Built-in piezo sensor for precise tuning accuracy.
• Automatic power-off function.

Specifications:

• Tuning range: A0(27.5Hz) ~ C8(4186Hz)
• Tuning mode: Chromatic
• Tuning precision: ±1cent
• A4 range: 440Hz
• Detection method: Clip
• Tuning method: Auto
• Power supply: 3V(CR2032) Lithium battery
• Dimensions: 53mm(L) x 35mm(W) x 27mm(H)
• Weight: 21g