The lightweight wireless neckloop speaker fits smoothly around your neck and rests on your shoulders, providing a comfortable and secure fit for long periods of use or while relaxing Along with the latest Bluetooth 5.0 which connects to smartphones, you can also use the TF card (max 32g) slot to listen to your favorite music Built-in 3Wx2 Bluetooth wireless speaker system, front facing upwards speakers surround you with deep and rich sound, creating a truly unique and immersive sound experience You can enjoy music when you go out for sports such as walking, cycling, mountain climbing, etc. Specifications: Bluetooth compatible version: V5.0 and EDR Bluetooth compatible protocol: RF5.0 BB5.0 LMP5.0 AVCTP1.4 GAVDP1.3 HFPV1.7 A2DPV1.3, AVRCPV1.6 SSP V1.2 etc. Material: ABS plastic and cloth net and TPU (handle) Output power: max. 2x3W Response frequency: 2.4GHz-2.480GHz Speaker unit: Double speaker, 3Wx2, platinum inner magnet impedance andPhi 33 or 4andOmega Signal-to-noise ratio: andge 80dB Distortion: andle 3 percent Sensitivity: -88DBMandplusmn 2dBm Transmission power: support class 1 or class 2 or class 3 maximum adjustable 6dBm Input voltage: DC 5V Audio Type: Dual Channel Charging current: In DC 5v 500mA andplusmn 10mA when charging, the speaker's red light is on and the red light is off Working current: (3.7V 1kHz 0dBm battery) Average 600mA Shutdown current: andle 50uA Temperature range: -25℃ to and65℃ Speaker battery: 500mAh, battery model 802540 polymer plus protection board (Micro 5 Pin charging interface) Transmission distance: andge 10 meters (no barrier) Talk time is about 5 hours and standby time is about 7200 hours Bluetooth support playback 60-70 percent volume listening time is about 12-13 hours, 100 percent volume listening time is about 5 hours TF card plays 60-70 percent volume, listening time about 10-12hours. 100 percent volume, listening time about 4 hours