Made in India portable bullet speaker SP-57 Rustam Series.  SP-57 Bluetooth speaker offers loss-less audio performance & strong stereo surround sound along with high treble, full midrange & shocking extra bass so you can enjoy your music live never-before. Featuring a Sound bar profile, the offered Wireless Bluetooth speaker is quite portable and can be perfectly put into the backpack. It supports both wireless Bluetooth and wired playback modes for being perfectly compatible with smart phone, tablet, computer, TV, laptop and other playback devices. With built-in microphone, you can also do hands-free calling. No matter if you have a playback device or not; it features a standard SD card & USB reader to let you play your music files directly from the flash drive. Besides, there are 4 buttons on the top: V-, Mode, V+ & Call/Play. Built-in Li-Ion rechargeable 1000mAh lithium battery provides up to 6 hrs battery backup for music playback anywhere at full volume. Besides, it can be easily charged via given or any other standard cable with micro-USB connector. Power Output (RMS): 5 W, Battery life: 6 Hrs, Charging Time: 2 Hrs, BT Version: 5.0, Memory Card Slot, Wireless music streaming via BT, Configuration: Mono, Built-in FM Radio: Yes, Sales Package: 1 Bluetooth Speaker, Outdoor Usage: Yes, USB Ports: 1, Memory Card Supported: Micro SD, Signal to Noise Ratio: 80 dB, Width: 19 cm, Height: 8 cm, Depth: 8 cm, Headphone Jack: yes Sweat Proof: Yes Deep Bass: Yes, Color: Yellow/Silver  (Color depends on the availability of stock).