The Calrad 40-BT4 Bluetooth V3.0 Stereo Audio 2 in 1 Transmitter and Receiver options provides 30 ft. of wireless connectivity. Easily pairs with all Bluetooth compatible devices. When the 40-BT4 is set to Receiver (RX) mode the Bluetooth wireless receiver can decode audio to the 3.5mm line output jack that can easily connect to a home stereo or PC line input for wireless Bluetooth audio, play music from any Bluetooth A2DP enabled mobile phone or other Bluetooth A2DP audio devices. Listen to your audio in comfort without a wired connection, Also in RX mode you can remotely play and pause content. When the 40-BT4 is set to Transmitter (TX) mode the Bluetooth wireless transmitter can transmit Bluetooth A2DP audio using the same the 3.5mm line input jack to AV stereo receivers and other compatible Bluetooth receiver devices.

The Calrad 40-BT5 Combination Bluetooth Transmitter Receiver uses Class 1 V 5.0 Bluetooth technology. A high gain dual antenna design is used to achieve long range connectivity, with distances up to 262 ft in open air free space. Use all your Bluetooth devices for reliable operation. Switch the 40-BT5 in to bypass mode for wired (Toslink) Digital PCM to Analog Stereo audio conversion. Tabletop or Wall mount options. Easy connectivity and Pairing to all devices, Computers, Smart phones, Smart watches, Set Top Boxes. DC or Battery powered for portable use.

Calrad's 40-BT2 Bluetooth wireless receiver has a 3.5mm line output jack that can easily connect to a home stereo or PC line input for wireless Bluetooth audio playback. Play music from any Bluetooth A2DP enabled mobile phone or other Bluetooth A2DP audio devices at up to 35 ft., distance may vary with surroundings. Listen to your audio in comfort without a wired connection. Includes USB charging cable, 3.5mm adapter cable. Works with USB power or by battery power.

Specifications:
Bluetooth specification: Bluetooth V2.1
Bluetooth profiles: A2DP and AVRCP, Operating distance: 10 meters Class n
Bluetooth frequency range: 2.4GHz- 2.4835GHz
Rechargeable 250mAH Li-polymer battery
Working time: Up to 12 hours
Standby time: 230 hours
Charging time: About 2.5 hours
Charging input: DC 5V/300mA
Dimensions: L-1.82" * W-1.33" * H-0.327"
Weight: 14g