Product descriptionFeatures:* 2in1 Wireless Bluetooth Speaker & 3600mAh External Backup Battery Charger for Phones、 Tablets、 PCs、 MP3、 MP4、 etc.* Waterproof/Shockproof/Dust proof rechangeable silicon case.* Near Field Communications (NFC) technology which allows for easy、 one-touch pairing by simply tapping your NFC-enabled Bluetooth smartdevice on the speaker.* IPX4 Splash-Proof & Shock-Resistant Design - Built-in 3600mAh Rechargeable Battery - Easy-Push Button Controls - Impressive Bass Output.* Built-in Li-ion battery means you're free to place your speaker almost anywhere you please、 plus the battery can be easily charged via astandard micro USB connection.* Metal Hook Loop for Easy Attachment to Chain、 Wire、 Karabiner、 Clip、 etc. Effectively Recreates Lows、 Mids and Highs.* Built-in Bluetooth Technology - Stream Music Wirelessly - Works with Virtually any Bluetooth-Enabled Device (Smartphones、 Tablets、 PCs、 MP3Players、 etc.) Specification:* Bluetooth Resolution: CSR 4.0* Water Resistance: IPX4* Output Power: 3wx2* Frequency Response: 20HZ~20kHz* Battery Li-ion: 3.7V* Battery Capacity: 3600mAh* Audio Input: 3.5mm Jack Cable and power connector* Power Indicator Light: Blue lights* Range: up to 10 meters open field* Compatible with: Phones、 Tablets、 PCS、 MP3 Player、 etc. All Bluetooth enable devices.* Material: Plastic+Silicone* Color: Black* Dimensions: 66 x 66 x 170mmPackage includes:1 x Bluetooth Speaker1 x Metal Hook Loop1 x 3.5mm Jack Cable1 x Micro USB Charging Cable1 x User Manual Net Weight: 710g