Features Durable material: the key body is made of excellent plate and the bottom original rubber anti-slip strip, which has a long service life. 3.5MM OUTPUT INTERFACE The output interface is a 3.5mm dual channel jack, the connection is stable and reliable, and easy to install. For radio experiments: this automatic key is ideal for radio amateurs, for CW morse code or shortwave radio communication experiments. HIGH PERFORMANCE The automatic paddle key is compact and lightweight, with fine workmanship, high sensitivity and good reliability. Fine workmanship: the key uses silver-plated contacts and the paint surface is treated with environmentally friendly matte, with stable performance. Specification: Item Type:Automatic Paddle Wrench Material: ABS, excellent plate. Product size: approx. 76 x 66 x 40 mm / 3 x 2.6 x 1.6 inches (without the size of the paddle overhang). Output interface: 3.5mm dual channel Package list: 1 x automatic key. Small note: There is a protective film on the non-slip strip at the bottom of the key body, which can be used after removal. If the non-slip strip is dirty after some time, it can be cleaned with a damp cloth. Package List 1 x Automatic Key