Specifications:

• Input Volt – 5 V DC, Audio Out : L R G (it must be connected to amplifire)
• Make Any Speaker Wireless, Make your Car Audio System Wireless
• Convers Speakers into Bluetooth Speakers
• Allows you to play songs to your speakers directly from your phone, Compact and Small can be powered with usb wall power adapter
• Can buy with PAM8403 Mini 5V Digital Small Power Amplifier Board

Features 

• BT Version: Bluetooth Specification V4.0 BLE
• Send and receive no bytes limit.
• Working frequency: 2.4GHz ISM band
• Modulation method: GFSK(Gaussian Frequency Shift Keying)
• RF Power: -23dbm, -6dbm, 0dbm, 6dbm, can modify through AT Command AT+POWE.
• Speed: Asynchronous: 6K Bytes
• Synchronous: 6K Bytes
• Security: Authentication and encryption
• Service: Central & Peripheral UUID FFE0,FFE1
• Power: +3.3VDC 50mA
• Long range: Open space have 100 Meters with iphone4s
• Power: In sleep mode 400uA~1 .5mA, Active mode 8.5mA.
• Working temperature:–5 ~ +65 Centigrade
• Size: HM-10 26.9mm x 1 3mm x 2.2 mm;