This is the E-Flite LiPo 1S 300mA USB charger.

Features:

• Charges most 1S batteries using E-Flite ultra microconnector
• Covenient-use anywhere a powered USB port is available
• Works with a USB computer port, USB car charger adapter, ora USB AC power charger adapter
• DC Input: 5.0V 350mA
• DC Output: 4.2V 300mA