Bluetooth® connectivity speaker with high-capacity lithium battery -4.200 mAh- built-in. The speaker, with Bluetooth® 3.0 connection, delivers 3W of power and has hands-free function. Compatible with iOS and Android, includes mini USB charging cable and comes presented in an attractive 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: Power bank overcharge protection system. Complete discharge protection system, which increases the durability of the power bank. Blocking system to prevent short circuits. Constant charging transfer system, in accordance with the capacity of the target device.