SonarPen - World's most affordable smart pen for iPhone, iPad and Android
SonarPen is a battery-free smart pen that's packed with smart features. Just connect it to the 3.5mm audio port on the iPad, iPhone or Android. Your professional creative canvas is now ready for you.
All of this, at the price of 5 cups of coffee.

• Full feature: Pressure sensitive Palm rejection(finger rejection on Android)
• Shortcut button Battery-less operation plug and create.
• For iPad and iPhone running iOS 8+ (iPhone 5 or newer, iPad 2 or newer)
• For Android devices running OS 4.4+ (LG, Samsung, Motorola, Nokia, Huawei, Asus, Lenovo mobile phones and tablets)
• Includes: SonarPen x 1, Universial magnetic pen holder x 1, Spare nib x 1