DescriptionBased on zinc alloy which is extremely durable. Ideal for medium to high risk of theft, the padlocks are recommended for a wide range of security requirements. All models in this series have a par acentric keyway, zinc alloy plated cylinder cores and hardened steel shackle. The lock is built to resists being picked by a shim (along the sides of the shackle), and also has a unique internal mechanism that is more difficult to pick. And, because there is a metal barrier that blocks the shackle, it is also more difficult to clip with bolt cutters. Variations vary in sizes where small is 40mm Medium is 50mm and Large is 670mmP475.0 +EDRWireless  5.0 version TF Card FM Radio MP3 player/ Wirelessscope of work 10metersTalk Time 6 hours Supports automatic Switchover to incoming call dunctionDescription: High Quality--- High Quality Bluetooth High Speed Connected, Anwsering Incoming Calls, Handsfree Talking, Superior Compability, High Fidelity Stereo Surround Sound. Foldable Portable Design--- This foldable portable design makes it easy to take along on that vacation or business trip or to store in your desk drawer for use at work. Adjustable Headband--- The headphones offer not only style with a slim profile but also an adjustable contoured headband, it allows you to get a great position on your head. Easy to controls your headphones--- Can freely control the switch of previous song and  song, pausing song, answering calls, ending calls, refusing the incoming call, dialing the last number, volume control. Works with or without Bluetooth capability--- Not only wireless, also can be used as wired headphone (Provides a simple 3.5mm wired connection of a variety of devices).Specifications: Bluetooth version: ISSC4.1 + EDR. Support Profiles: HSP, HFP, A2DP, AVRCP. Profile and Advanced Audio Distribution Profile(A2DP). Operation Distance: 10m. Transmitting Power: Class 2. Frequency Range: 2.4026 GHz-2.480 GHz. Resistance: 32ohm. Sensitivity: 105dB+ / - 3dB. Rechargeable lithium battery: 300mAh. Talking Time: 8 hours. Music Playing Time: 4 hours. Standby Time: 120 hours. Charge Time: 2-3 hours. Plug Type: 3.5mm.