Etekcity Wireless Bluetooth 4.0 Receiver Audio Adapter (NFC-Enabled) for Sound System (Certified Refurbished) This Certified Refurbished product is tested & certified by Etekcity to look and work like-new. The product includes all original accessories, and is backed by a 90-day warranty STREAM WIRELESSLY: Enables traditional speakers with 4.0 bluetooth for wireless audio streaming from a range of 33 feet. RAPID RECHARGE: Runs for an extended period of up to 10 hours on a full charge. No interruptions, no problems. VERSATILE EXTENSION: Easily adapt via A/V, RCA, and 3.5mm jack input. Plays well with home theaters, stereo systems, and car stereos. NFC-CAPABILITY: Amplify the audio of your NFC-capable smart devices with a simple hand gesture. Simply ouch your smartphone or tablet to the bluetooth adapter and connect.