Portable battery with capacity up to 4.000 mAh and speaker with bluetooth transmission. This battery is suitable for charging smartphones (Android and iOS) and tablets and has the following technical specifications: 3W power, with 2'1 EDR bluetooth transmission up to 10m, 4.000 mAh battery capacity, 5-6 hours charging time, 30-hour autonomy, built-in conference call microphone, play/stop button directly on speaker. This promotional product is compatible with all devices that support Bluetooth streaming connectivity as well as the audio cable. Includes USB cable and Jack/Jack. 144 x 26 x 80 mm