We recommend using laptop USB port or computer USB port charging, because they are more stable voltage. For your bracelet battery life, prohibited inserted into the phone charging head charge. Please connect your bracelet to the charging cable, and then connected with computer or laptop USB port to get electricity. Type: Cable
Interface: USB 2.0
Package weight: 0.033 kg
Product Size (L x W x H): 10.5 x 1.5 x 0.8 cm / 4.13 x 0.59 x 0.31 inches
Package Size (L x W x H): 14.0 x 8.0 x 1.2 cm / 5.50 x 3.14 x 0.47 inches
Package Contents: 1 x USB Power Charger Data Sync Charging Cable Cord for Jawbone UP2 UP3 Smart Bracelet Wearable Device