Durable external auxiliary battery with solar charging and high capacity -4,000mAh-. In sporty style and covered with soft silicone. Specially designed for outdoor activities, splash water resistant and with aluminium carrying carabiner. Dual USB output for charging two devices simultaneously, with LED charging status indicators and powerful LED light with SOS signalling for use in case of emergency. Including a micro USB charging cable. Available in a wide range of colours, presented in an attractive, individual design box. The capacities shown in all our external auxiliary batteries are real, all of them incorporating non-recycled, grade A batteries, with a service life of at least 500 charging cycles, and complying with CE regulations.In addition, they are manufactured according RoHS standards, and in compliance with the following safety requirements:Overcharge protection system.Complete discharge protection system, which increases the durability of the device.Blocking system to prevent short circuits.Constant charging transfer system, in accordance with the capacity of the target device.