Main Features:<br>With a DC 2.1mm power jack <br>Plug directly into an Arduino<br>Hold 6 x 7.2V rechargeable NiMH/NiCd AA battery or 9V alkaline battery<br>Power supply for monolithic system， arduino system， 2WD mobile robot etc<br><br> Specifications<br>General<br> Type: Battery case <br>Weight and Size<br> Product Weight: 0.025 kg <br> Package Weight: 0.050 kg <br> Product Size(L x W x H): 9.0 x 5.6 x 1.5 cm/ 3.5 x 5.6 x 1.5 inches <br> Package Size(L x W x H): 10.0 x 7.0 x 3.0 cm <br>Package Contents<br> Package Contents: 1 x Battery Holder <br><br>