Use 9V Battery Snap Connector to connect a 9V battery to anything with a 5.5×2.1mm plug. This Snap Connector is useful to power-up development boards (like the Arduino) with a 9V battery. The cable has a moulded 5.5×2.1mm plug on one end, and a 9V battery snaps on the other. The battery snap covers the battery contacts to prevent shortcircuits, and it’s made of plastic, so it is more durable than traditional clips. The polarity on the plug is positive at the centre. Features of 9V Battery Snap Connector to DC Male Power Adapter Cable for Arduino: Brand new and high quality Works with official Arduino boards Hard plastic T-type connector Material: ABS Length: 15cm Specification of 9V Battery Snap Connector to DC Male Power Adapter Cable for Arduino: General Model LDTR – PJ0003 Mainly Compatible with Ardunio & DC Socket Material ABS Color Black Weight and Size Product weight 0.005 kg Package weight 0.026 kg Product Size(L x W x H) 15.00 x 2.50 x 0.50 cm / 5.91 x 0.98 x 0.2 inches Package Size(L x W x H) 7.00 x 5.00 x 2.00 cm / 2.76 x 1.97 x 0.79 inches The focus keyphrase is the phrase that you want your post or page to be found for in search engines. Sometimes, it is a single word, but it usually consists of a few words. That’s why we call it a keyphrase. For example, if you want your blog post to rank for ‘healthy snacks’, then optimize your post for that term. Your focus keyphrase can also be longer. For instance, you could write an article about healthy snacks specifically made for kids and optimize for ‘healthy snacks for kids’. Or a post about healthy snacks to eat after a workout, and optimize for ‘healthy snacks after workout’.